[H]ard|OCP has posted a link to where you can get the new Vista/Server 2008 SP2 release candidate.  The first and most important step to take is to remove the beta version of SP2 if you have installed it, skipping that step may well ruin your day.  The stand alone package is about 300MB for x86 and 500MB for the x64 version.  There are numerous compatibility issues fixed ranging from POP3 support for ZoneAlarm to support for VIA 64bit processors.  If you do try it out, bookmark the feedback link so you can report anything you want fixed before the final release.

“You can download the Windows Vista and Windows Server 2008 Service Pack 2 RC from our Customer Preview Program site or install through Windows Update using our Windows Update Experience Kit. If you have the SP2 for Windows Vista and Windows Server 2008 Beta installed, you will need to uninstall that first before installing the RC.”

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