Yesterday it was announed that WIF - Windows Identity Foundation SDK RC was released in public domain. I tried installing the msu file from MSDN on my PC which has Home Premium edition of Vista and it failed? Microsoft mentions that Vista is supported but does not mention any versions of Vista on the site...Does anyone have similar problems??
I have the exact same issue on a Windows Server 2008 Standard Edition box. I had the WIF Beta 2 uninstalled prior to installing the RC. Any chance that the .msu is confused with something that is left behind by the B2 uninstall script.
Frank
Update...
Found a thread on MS Geneva forum that talks about needing SP2 for WS 2008 and Vista. Just finished installing the RC.
Download link - http://www.microsoft.com/downloads/details.aspx?FamilyID=a4dd31d5-f907-4406-9012-a5c3199ea2b3&displaylang=en
Good luck.