Well, I just upgraded a bunch of our workstations to Windows 7 during this week. These are fresh installs, not "upgrades". So far, I have a pretty even mix of 32b Pro, 32b Ultimate, and 64b Ultimate. We have a Windows 2008 Native mode domain. At this point, I've not experienced any InGroup issues.

Glenn
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Actually I am a Rocket Scientist! \:D