VS2010默认安装的是MVC2，安装MVC4必须先装 SP1，然后安装MVC4.

VS2010 SP1 (1.5G)下载地址：
http://go.microsoft.com/fwlink/?LinkId=210710

MVC4(在线安装)下载地址：
https://www.microsoft.com/web/handlers/webpi.ashx/getinstaller/MVC4VS2010_Loc.appids

VS 2010 签入时 报错：
Checkin cannot proceed because the policy requirements have not been satisfied.

解决办法： 安装tfpt.msi

参考：
http://www.dotnetbase.co.uk/post/2011/05/05/TFS-2010-Error-loading-the-Changeset-Comments-Policy-policy.aspx
http://blogs.msdn.com/b/ramoji/archive/2009/08/26/checkin-cannot-proceed-because-the-policy-requirements-have-not-been-satisfied.aspx