diff --git a/src/core/support/alloc.c b/src/core/support/alloc.c
index a19a0141d45..d2ed82e7717 100644
--- a/src/core/support/alloc.c
+++ b/src/core/support/alloc.c
@@ -55,7 +55,7 @@ void *gpr_realloc(void *p, size_t size) {
 }
 
 void *gpr_malloc_aligned(size_t size, size_t alignment_log) {
-  size_t alignment = 1 << alignment_log;
+  size_t alignment = ((size_t)1) << alignment_log;
   size_t extra = alignment - 1 + sizeof(void *);
   void *p = gpr_malloc(size + extra);
   void **ret = (void **)(((gpr_uintptr)p + extra) & ~(alignment - 1));
diff --git a/src/core/support/time_win32.c b/src/core/support/time_win32.c
index 539470bccfe..f4443b5c2d7 100644
--- a/src/core/support/time_win32.c
+++ b/src/core/support/time_win32.c
@@ -64,7 +64,7 @@ void gpr_sleep_until(gpr_timespec until) {
     }
 
     delta = gpr_time_sub(until, now);
-    sleep_millis = delta.tv_sec * GPR_MS_PER_SEC + delta.tv_nsec / GPR_NS_PER_MS;
+    sleep_millis = (DWORD)delta.tv_sec * GPR_MS_PER_SEC + delta.tv_nsec / GPR_NS_PER_MS;
     Sleep(sleep_millis);
   }
 }
diff --git a/src/core/transport/transport_op_string.c b/src/core/transport/transport_op_string.c
index 04c1d790226..7bbe8276c38 100644
--- a/src/core/transport/transport_op_string.c
+++ b/src/core/transport/transport_op_string.c
@@ -41,6 +41,9 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/useful.h>
 
+/* These routines are here to facilitate debugging - they produce string
+   representations of various transport data structures */
+
 static void put_metadata(gpr_strvec *b, grpc_mdelem *md) {
   gpr_strvec_add(b, gpr_strdup("key="));
   gpr_strvec_add(
diff --git a/src/objective-c/examples/Sample/Podfile.lock b/src/objective-c/examples/Sample/Podfile.lock
deleted file mode 100644
index ccf5aa0f06b..00000000000
--- a/src/objective-c/examples/Sample/Podfile.lock
+++ /dev/null
@@ -1,44 +0,0 @@
-PODS:
-  - gRPC (0.0.1):
-    - gRPC/C-Core (= 0.0.1)
-    - gRPC/GRPCClient (= 0.0.1)
-    - gRPC/ProtoRPC (= 0.0.1)
-    - gRPC/RxLibrary (= 0.0.1)
-  - gRPC/C-Core (0.0.1):
-    - OpenSSL (~> 1.0.200)
-  - gRPC/GRPCClient (0.0.1):
-    - gRPC/C-Core
-    - gRPC/RxLibrary
-  - gRPC/ProtoRPC (0.0.1):
-    - gRPC/GRPCClient
-    - gRPC/RxLibrary
-  - gRPC/RxLibrary (0.0.1)
-  - OpenSSL (1.0.201)
-  - ProtocolBuffers (1.9.8)
-  - RemoteTest (0.0.1):
-    - gRPC (~> 0.0)
-    - ProtocolBuffers (~> 1.9)
-  - Route_guide (0.0.1):
-    - ProtocolBuffers (~> 1.9)
-
-DEPENDENCIES:
-  - gRPC (from `../../../..`)
-  - RemoteTest (from `RemoteTestClient`)
-  - Route_guide (from `RouteGuideClient`)
-
-EXTERNAL SOURCES:
-  gRPC:
-    :path: ../../../..
-  RemoteTest:
-    :path: RemoteTestClient
-  Route_guide:
-    :path: RouteGuideClient
-
-SPEC CHECKSUMS:
-  gRPC: f6c1bf5dde59ab543e4bd1d5e2ea56da4a9a0253
-  OpenSSL: 4e990d04b14015c49c800c400b86ae44a4818a5c
-  ProtocolBuffers: 9a4a171c0c7cc8f21dd29aeca4f9ac775d84a880
-  RemoteTest: 021a51c04d5795f286b379ca5ef14d0be5b2fb9b
-  Route_guide: a277da8eef182774abb050d7b81109f5878f8652
-
-COCOAPODS: 0.36.0
diff --git a/src/objective-c/examples/Sample/SampleTests/RemoteProtoTests.m b/src/objective-c/examples/Sample/SampleTests/RemoteProtoTests.m
index 6c5de812770..2ef6a6e4ab9 100644
--- a/src/objective-c/examples/Sample/SampleTests/RemoteProtoTests.m
+++ b/src/objective-c/examples/Sample/SampleTests/RemoteProtoTests.m
@@ -34,6 +34,7 @@
 #import <UIKit/UIKit.h>
 #import <XCTest/XCTest.h>
 
+#import <gRPC/GRXWriter+Immediate.h>
 #import <RemoteTest/Messages.pb.h>
 #import <RemoteTest/Test.pb.h>
 
@@ -48,43 +49,85 @@
   _service = [[RMTTestService alloc] initWithHost:@"grpc-test.sandbox.google.com"];
 }
 
-- (void)testEmptyRPC {
-  __weak XCTestExpectation *noRPCError = [self expectationWithDescription:@"RPC succeeded."];
-  __weak XCTestExpectation *responded = [self expectationWithDescription:@"Response received."];
+// Tests as described here: https://github.com/grpc/grpc/blob/master/doc/interop-test-descriptions.md
 
-  [_service emptyCallWithRequest:[RMTEmpty defaultInstance]
-                         handler:^(RMTEmpty *response, NSError *error) {
+- (void)testEmptyUnaryRPC {
+  __weak XCTestExpectation *expectation = [self expectationWithDescription:@"EmptyUnary"];
+
+  RMTEmpty *request = [RMTEmpty defaultInstance];
+
+  [_service emptyCallWithRequest:request handler:^(RMTEmpty *response, NSError *error) {
     XCTAssertNil(error, @"Finished with unexpected error: %@", error);
-    [noRPCError fulfill];
-    XCTAssertNotNil(response, @"nil response received.");
-    [responded fulfill];
+
+    id expectedResponse = [RMTEmpty defaultInstance];
+    XCTAssertEqualObjects(response, expectedResponse);
+
+    [expectation fulfill];
   }];
 
   [self waitForExpectationsWithTimeout:2. handler:nil];
 }
 
-- (void)testSimpleProtoRPC {
-  __weak XCTestExpectation *noRPCError = [self expectationWithDescription:@"RPC succeeded."];
-  __weak XCTestExpectation *responded = [self expectationWithDescription:@"Response received."];
-  __weak XCTestExpectation *validResponse = [self expectationWithDescription:@"Valid response."];
+- (void)testLargeUnaryRPC {
+  __weak XCTestExpectation *expectation = [self expectationWithDescription:@"EmptyUnary"];
 
   RMTSimpleRequest *request = [[[[[[RMTSimpleRequestBuilder alloc] init]
-                                  setResponseSize:100]
-                                 setFillUsername:YES]
-                                setFillOauthScope:YES]
+                                  setResponseType:RMTPayloadTypeCompressable]
+                                 setResponseSize:314159]
+                                setPayloadBuilder:[[[RMTPayloadBuilder alloc] init]
+                                             setBody:[NSMutableData dataWithLength:271828]]]
                                build];
+
   [_service unaryCallWithRequest:request handler:^(RMTSimpleResponse *response, NSError *error) {
     XCTAssertNil(error, @"Finished with unexpected error: %@", error);
-    [noRPCError fulfill];
-    XCTAssertNotNil(response, @"nil response received.");
-    [responded fulfill];
-    // We expect empty strings, not nil:
-    XCTAssertNotNil(response.username, @"Response's username is nil.");
-    XCTAssertNotNil(response.oauthScope, @"Response's OAuth scope is nil.");
-    [validResponse fulfill];
+
+    id expectedResponse = [[[[RMTSimpleResponseBuilder alloc] init]
+                            setPayloadBuilder:[[[[RMTPayloadBuilder alloc] init]
+                                                setType:RMTPayloadTypeCompressable]
+                                               setBody:[NSMutableData dataWithLength:314159]]]
+                           build];
+    XCTAssertEqualObjects(response, expectedResponse);
+
+    [expectation fulfill];
   }];
 
-  [self waitForExpectationsWithTimeout:2. handler:nil];
+  [self waitForExpectationsWithTimeout:4. handler:nil];
+}
+
+- (void)testClientStreamingRPC {
+  __weak XCTestExpectation *expectation = [self expectationWithDescription:@"EmptyUnary"];
+
+  id request1 = [[[[RMTStreamingInputCallRequestBuilder alloc] init]
+                  setPayloadBuilder:[[[RMTPayloadBuilder alloc] init]
+                                     setBody:[NSMutableData dataWithLength:27182]]]
+                 build];
+  id request2 = [[[[RMTStreamingInputCallRequestBuilder alloc] init]
+                  setPayloadBuilder:[[[RMTPayloadBuilder alloc] init]
+                                     setBody:[NSMutableData dataWithLength:8]]]
+                 build];
+  id request3 = [[[[RMTStreamingInputCallRequestBuilder alloc] init]
+                  setPayloadBuilder:[[[RMTPayloadBuilder alloc] init]
+                                     setBody:[NSMutableData dataWithLength:1828]]]
+                 build];
+  id request4 = [[[[RMTStreamingInputCallRequestBuilder alloc] init]
+                  setPayloadBuilder:[[[RMTPayloadBuilder alloc] init]
+                                     setBody:[NSMutableData dataWithLength:45904]]]
+                 build];
+  id<GRXWriter> writer = [GRXWriter writerWithContainer:@[request1, request2, request3, request4]];
+
+  [_service streamingInputCallWithRequestsWriter:writer
+                                         handler:^(RMTStreamingInputCallResponse *response, NSError *error) {
+    XCTAssertNil(error, @"Finished with unexpected error: %@", error);
+
+    id expectedResponse = [[[[RMTStreamingInputCallResponseBuilder alloc] init]
+                            setAggregatedPayloadSize:74922]
+                           build];
+    XCTAssertEqualObjects(response, expectedResponse);
+
+    [expectation fulfill];
+  }];
+
+  [self waitForExpectationsWithTimeout:4. handler:nil];
 }
 
 @end
diff --git a/templates/vsprojects/grpc.sln.template b/templates/vsprojects/grpc.sln.template
index 883efd594ca..7465852e70b 100644
--- a/templates/vsprojects/grpc.sln.template
+++ b/templates/vsprojects/grpc.sln.template
@@ -26,14 +26,20 @@ EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Win32 = Debug|Win32
+		Debug|x64 = Debug|x64
 		Release|Win32 = Release|Win32
+		Release|x64 = Release|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 % for project in vsprojects:
 		${project.vs_project_guid}.Debug|Win32.ActiveCfg = Debug|Win32
 		${project.vs_project_guid}.Debug|Win32.Build.0 = Debug|Win32
+		${project.vs_project_guid}.Debug|x64.ActiveCfg = Debug|x64
+		${project.vs_project_guid}.Debug|x64.Build.0 = Debug|x64
 		${project.vs_project_guid}.Release|Win32.ActiveCfg = Release|Win32
 		${project.vs_project_guid}.Release|Win32.Build.0 = Release|Win32
+		${project.vs_project_guid}.Release|x64.ActiveCfg = Release|x64
+		${project.vs_project_guid}.Release|x64.Build.0 = Release|x64
 % endfor
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
diff --git a/templates/vsprojects/vcxproj_defs.include b/templates/vsprojects/vcxproj_defs.include
index 062a3b02476..af215d6a2a0 100644
--- a/templates/vsprojects/vcxproj_defs.include
+++ b/templates/vsprojects/vcxproj_defs.include
@@ -13,10 +13,18 @@ ${gen_package_props(packages)}\
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>${project_guid if project_guid else project.vs_project_guid}</ProjectGuid>
@@ -36,12 +44,23 @@ ${gen_package_props(packages)}\
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>${configuration_type}</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>${configuration_type}</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>${configuration_type}</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -52,6 +71,13 @@ ${gen_package_props(packages)}\
     <Import Project="..\${prop}.props" />
     % endfor
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+    % for prop in additional_props:
+    <Import Project="..\${prop}.props" />
+    % endfor
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="..\global.props" />
@@ -59,13 +85,26 @@ ${gen_package_props(packages)}\
     <Import Project="..\${prop}.props" />
     % endfor
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+    % for prop in additional_props:
+    <Import Project="..\${prop}.props" />
+    % endfor
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <TargetName>${name}</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetName>${name}</TargetName>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <TargetName>${name}</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetName>${name}</TargetName>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
@@ -79,6 +118,19 @@ ${gen_package_props(packages)}\
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>${get_subsystem(project.is_library)}</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -96,6 +148,23 @@ ${gen_package_props(packages)}\
       <OptimizeReferences>true</OptimizeReferences>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>${get_subsystem(project.is_library)}</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
   % if project.get('public_headers',[]):
   <ItemGroup>
     % for public_header in project.public_headers:
diff --git a/test/core/util/port_windows.c b/test/core/util/port_windows.c
index 17058c33533..fc521504356 100644
--- a/test/core/util/port_windows.c
+++ b/test/core/util/port_windows.c
@@ -57,7 +57,7 @@ static int is_port_available(int *port, int is_tcp) {
 
   GPR_ASSERT(*port >= 0);
   GPR_ASSERT(*port <= 65535);
-  if (fd < 0) {
+  if (INVALID_SOCKET == fd) {
     gpr_log(GPR_ERROR, "socket() failed: %s", strerror(errno));
     return 0;
   }
diff --git a/vsprojects/gpr/gpr.vcxproj b/vsprojects/gpr/gpr.vcxproj
index 11240f4a7c8..e42c656fdcd 100644
--- a/vsprojects/gpr/gpr.vcxproj
+++ b/vsprojects/gpr/gpr.vcxproj
@@ -5,10 +5,18 @@
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}</ProjectGuid>
@@ -28,12 +36,23 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -41,17 +60,31 @@
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="..\global.props" />
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="..\global.props" />
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <TargetName>gpr</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetName>gpr</TargetName>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <TargetName>gpr</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetName>gpr</TargetName>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
@@ -65,6 +98,19 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -82,6 +128,23 @@
       <OptimizeReferences>true</OptimizeReferences>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="..\..\include\grpc\support\alloc.h" />
     <ClInclude Include="..\..\include\grpc\support\atm.h" />
diff --git a/vsprojects/gpr_test_util/gpr_test_util.vcxproj b/vsprojects/gpr_test_util/gpr_test_util.vcxproj
index c156fda2b87..504a2cd5995 100644
--- a/vsprojects/gpr_test_util/gpr_test_util.vcxproj
+++ b/vsprojects/gpr_test_util/gpr_test_util.vcxproj
@@ -5,10 +5,18 @@
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{EAB0A629-17A9-44DB-B5FF-E91A721FE037}</ProjectGuid>
@@ -28,12 +36,23 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -41,17 +60,31 @@
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     <Import Project="..\global.props" />
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="..\global.props" />
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <TargetName>gpr_test_util</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetName>gpr_test_util</TargetName>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <TargetName>gpr_test_util</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetName>gpr_test_util</TargetName>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
@@ -65,6 +98,19 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -82,6 +128,23 @@
       <OptimizeReferences>true</OptimizeReferences>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="..\..\test\core\util\test_config.h" />
   </ItemGroup>
diff --git a/vsprojects/grpc++/grpc++.vcxproj b/vsprojects/grpc++/grpc++.vcxproj
index ac3191a8b2d..46b4a4c0eb5 100644
--- a/vsprojects/grpc++/grpc++.vcxproj
+++ b/vsprojects/grpc++/grpc++.vcxproj
@@ -5,10 +5,18 @@
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}</ProjectGuid>
@@ -28,12 +36,23 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -41,17 +60,31 @@
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="..\global.props" />
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="..\global.props" />
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <TargetName>grpc++</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetName>grpc++</TargetName>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <TargetName>grpc++</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetName>grpc++</TargetName>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
@@ -65,6 +98,19 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -82,6 +128,23 @@
       <OptimizeReferences>true</OptimizeReferences>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="..\..\include\grpc++\async_generic_service.h" />
     <ClInclude Include="..\..\include\grpc++\async_unary_call.h" />
diff --git a/vsprojects/grpc.sln b/vsprojects/grpc.sln
index 1f286f51b22..b978eb3e514 100644
--- a/vsprojects/grpc.sln
+++ b/vsprojects/grpc.sln
@@ -49,41 +49,75 @@ EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Win32 = Debug|Win32
+		Debug|x64 = Debug|x64
 		Release|Win32 = Release|Win32
+		Release|x64 = Release|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}.Debug|Win32.ActiveCfg = Debug|Win32
 		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}.Debug|Win32.Build.0 = Debug|Win32
+		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}.Debug|x64.ActiveCfg = Debug|x64
+		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}.Debug|x64.Build.0 = Debug|x64
 		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}.Release|Win32.ActiveCfg = Release|Win32
 		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}.Release|Win32.Build.0 = Release|Win32
+		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}.Release|x64.ActiveCfg = Release|x64
+		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}.Release|x64.Build.0 = Release|x64
 		{EAB0A629-17A9-44DB-B5FF-E91A721FE037}.Debug|Win32.ActiveCfg = Debug|Win32
 		{EAB0A629-17A9-44DB-B5FF-E91A721FE037}.Debug|Win32.Build.0 = Debug|Win32
+		{EAB0A629-17A9-44DB-B5FF-E91A721FE037}.Debug|x64.ActiveCfg = Debug|x64
+		{EAB0A629-17A9-44DB-B5FF-E91A721FE037}.Debug|x64.Build.0 = Debug|x64
 		{EAB0A629-17A9-44DB-B5FF-E91A721FE037}.Release|Win32.ActiveCfg = Release|Win32
 		{EAB0A629-17A9-44DB-B5FF-E91A721FE037}.Release|Win32.Build.0 = Release|Win32
+		{EAB0A629-17A9-44DB-B5FF-E91A721FE037}.Release|x64.ActiveCfg = Release|x64
+		{EAB0A629-17A9-44DB-B5FF-E91A721FE037}.Release|x64.Build.0 = Release|x64
 		{29D16885-7228-4C31-81ED-5F9187C7F2A9}.Debug|Win32.ActiveCfg = Debug|Win32
 		{29D16885-7228-4C31-81ED-5F9187C7F2A9}.Debug|Win32.Build.0 = Debug|Win32
+		{29D16885-7228-4C31-81ED-5F9187C7F2A9}.Debug|x64.ActiveCfg = Debug|x64
+		{29D16885-7228-4C31-81ED-5F9187C7F2A9}.Debug|x64.Build.0 = Debug|x64
 		{29D16885-7228-4C31-81ED-5F9187C7F2A9}.Release|Win32.ActiveCfg = Release|Win32
 		{29D16885-7228-4C31-81ED-5F9187C7F2A9}.Release|Win32.Build.0 = Release|Win32
+		{29D16885-7228-4C31-81ED-5F9187C7F2A9}.Release|x64.ActiveCfg = Release|x64
+		{29D16885-7228-4C31-81ED-5F9187C7F2A9}.Release|x64.Build.0 = Release|x64
 		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}.Debug|Win32.ActiveCfg = Debug|Win32
 		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}.Debug|Win32.Build.0 = Debug|Win32
+		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}.Debug|x64.ActiveCfg = Debug|x64
+		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}.Debug|x64.Build.0 = Debug|x64
 		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}.Release|Win32.ActiveCfg = Release|Win32
 		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}.Release|Win32.Build.0 = Release|Win32
+		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}.Release|x64.ActiveCfg = Release|x64
+		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}.Release|x64.Build.0 = Release|x64
 		{0A7E7F92-FDEA-40F1-A9EC-3BA484F98BBF}.Debug|Win32.ActiveCfg = Debug|Win32
 		{0A7E7F92-FDEA-40F1-A9EC-3BA484F98BBF}.Debug|Win32.Build.0 = Debug|Win32
+		{0A7E7F92-FDEA-40F1-A9EC-3BA484F98BBF}.Debug|x64.ActiveCfg = Debug|x64
+		{0A7E7F92-FDEA-40F1-A9EC-3BA484F98BBF}.Debug|x64.Build.0 = Debug|x64
 		{0A7E7F92-FDEA-40F1-A9EC-3BA484F98BBF}.Release|Win32.ActiveCfg = Release|Win32
 		{0A7E7F92-FDEA-40F1-A9EC-3BA484F98BBF}.Release|Win32.Build.0 = Release|Win32
+		{0A7E7F92-FDEA-40F1-A9EC-3BA484F98BBF}.Release|x64.ActiveCfg = Release|x64
+		{0A7E7F92-FDEA-40F1-A9EC-3BA484F98BBF}.Release|x64.Build.0 = Release|x64
 		{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}.Debug|Win32.ActiveCfg = Debug|Win32
 		{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}.Debug|Win32.Build.0 = Debug|Win32
+		{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}.Debug|x64.ActiveCfg = Debug|x64
+		{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}.Debug|x64.Build.0 = Debug|x64
 		{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}.Release|Win32.ActiveCfg = Release|Win32
 		{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}.Release|Win32.Build.0 = Release|Win32
+		{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}.Release|x64.ActiveCfg = Release|x64
+		{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}.Release|x64.Build.0 = Release|x64
 		{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}.Debug|Win32.ActiveCfg = Debug|Win32
 		{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}.Debug|Win32.Build.0 = Debug|Win32
+		{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}.Debug|x64.ActiveCfg = Debug|x64
+		{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}.Debug|x64.Build.0 = Debug|x64
 		{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}.Release|Win32.ActiveCfg = Release|Win32
 		{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}.Release|Win32.Build.0 = Release|Win32
+		{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}.Release|x64.ActiveCfg = Release|x64
+		{C187A093-A0FE-489D-A40A-6E33DE0F9FEB}.Release|x64.Build.0 = Release|x64
 		{D64C6D63-4458-4A88-AB38-35678384A7E4}.Debug|Win32.ActiveCfg = Debug|Win32
 		{D64C6D63-4458-4A88-AB38-35678384A7E4}.Debug|Win32.Build.0 = Debug|Win32
+		{D64C6D63-4458-4A88-AB38-35678384A7E4}.Debug|x64.ActiveCfg = Debug|x64
+		{D64C6D63-4458-4A88-AB38-35678384A7E4}.Debug|x64.Build.0 = Debug|x64
 		{D64C6D63-4458-4A88-AB38-35678384A7E4}.Release|Win32.ActiveCfg = Release|Win32
 		{D64C6D63-4458-4A88-AB38-35678384A7E4}.Release|Win32.Build.0 = Release|Win32
+		{D64C6D63-4458-4A88-AB38-35678384A7E4}.Release|x64.ActiveCfg = Release|x64
+		{D64C6D63-4458-4A88-AB38-35678384A7E4}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/vsprojects/grpc/grpc.vcxproj b/vsprojects/grpc/grpc.vcxproj
index 0bc594382ee..38920bb15ec 100644
--- a/vsprojects/grpc/grpc.vcxproj
+++ b/vsprojects/grpc/grpc.vcxproj
@@ -6,10 +6,18 @@
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{29D16885-7228-4C31-81ED-5F9187C7F2A9}</ProjectGuid>
@@ -29,12 +37,23 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -42,17 +61,31 @@
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="..\global.props" />
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="..\global.props" />
   </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\global.props" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <TargetName>grpc</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetName>grpc</TargetName>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <TargetName>grpc</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetName>grpc</TargetName>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
@@ -66,6 +99,19 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -83,6 +129,23 @@
       <OptimizeReferences>true</OptimizeReferences>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="..\..\include\grpc\grpc_security.h" />
     <ClInclude Include="..\..\include\grpc\byte_buffer.h" />
diff --git a/vsprojects/grpc_csharp_ext/grpc_csharp_ext.vcxproj b/vsprojects/grpc_csharp_ext/grpc_csharp_ext.vcxproj
index 2adb4a5367e..0ed2ebb3a7f 100644
--- a/vsprojects/grpc_csharp_ext/grpc_csharp_ext.vcxproj
+++ b/vsprojects/grpc_csharp_ext/grpc_csharp_ext.vcxproj
@@ -6,10 +6,18 @@
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
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