按照Brian Harry在他的博客上发布的说法: http://www.almnetworks.net/zh-CN/post/2010/06/30/TFS-2010-Beta-2RC-is-Expiring-Today.aspx
截至于2010年6月30日，也就是今天，所有预览版的TFS2010都将停止工作，包括Beta2和RC。这段时间经常接到有朋友和客户询问升级的问题，如果你到今天还没有行动话，那么情况可能会很糟糕。如果是这样，那么请看下面的延长试用时间的办法，但是还是希望大家尽快升级。
这是是一些我的苏格兰同事关于我们公司升级TFS的博客链接，从2008到beta2，再到RC和RTM，是一个非常完整的升级过程。
TFS 2008 to Beta2: (25-Sept-2009)
http://blog.hinshelwood.com/archive/2009/10/25/deploying-visual-studio-2010-team-foundation-server-beta-2.aspx
Beta2 to RC: (10-Feb-2010)
http://blog.hinshelwood.com/archive/2010/02/10/upgrading-from-tfs-2010-beta-2-to-tfs-2010-rc.aspx
RC to RTM: (12-Apr-2010, on the day of RTM release)
http://geekswithblogs.net/hinshelm/archive/2010/04/12/_upgrading-from-tfs-2010-rc-to-tfs-2010-rtm-done.aspx
如果你还是没有准备好，那么下面的办法是你唯一还可以延长90天试用时间的办法，还是赶紧升级吧：
To extend the beta2/RC beyond 6/30 you can update the license key with a “trial product” key that will replace the beta/RC key with a trial key that expires 90 days from when you update it.
Do the following command from an elevated command prompt on the AT:
1. Navigate to the “\program files\microsoft team foundation server 2010\tools” directory
2. Run “tfsconfig.exe license /productkey:3X62F-DRMVM-424XH-QVHFM-CXXDK”
The output should confirm that a “Trial License with 90 days remaining, expiring on xx/xx/2010” was installed. You can also open up the TFS Administration Console and refreshing the top level node should show a license type of “Trial”.