Microsoft's official enterprise support blog for AD DS and more
UPDATE June 19 2010 - stop reading and go here, we released ADMT 3.2:
Hi all, Ned here again. Microsoft is still working on ADMT 3.2, which can be installed on Windows Server 2008 R2 servers for migrations. There's no estimated date for this new tool yet.
In the meantime, we have tested ADMT 3.1 and come up with supported scenarios for using it to migrate to R2 domains. Below are two KB articles that cover the requirements, what's supported, and known issues. As anyone who has emailed me already knows, we definitely support running ADMT 3.1 on a Windows Server 2008 DC or member server in an R2 domain, and migrating with it will be supported. Read more about this:
Known issues that may occur when you use ADMT 3.1 to migrate to a domain that contains Windows Server 2008 R2 domain controllers - http://support.microsoft.com/kb/976659
You cannot uninstall ADMT 3.1 after you perform an in-place upgrade to Windows Server 2008 R2 - http://support.microsoft.com/kb/974625
Important note: If you do not have Windows Server 2008 (i.e. you went from Windows 2000 or Windows Server 2003 straight to Windows Server 2008 R2), you do have downgrade rights. See this website on how to get product keys and media for R2:
Perhaps the onslaught of emails about this can now subside... :-)
- Ned "go go go" Pyle
ADMT 3.2 is out now!