Support for SCE Beta 2 is now closed. All beta testers should be using the SCE RC1 bits available from http://connect.microsoft.com . Starting this week, users of Beta 2 will no longer be able to synch updates with Microsoft's site, so those SCE servers
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Read the complete post at http://blogs.technet.com/caseymck/archive/2007/03/27/upgrade-your-sce-beta-2-to-sce-rc1-immediately.aspx