Just in case you haven't been paying attention to the status of Exchange Server 2007 SP1, I just wanted to make my post that it has released and is available for download.  With SP1, we now support Exchange Server 2007 running on a Windows Server 2008 machine (when Windows Server 2008 releases).  We have also included enhancements to the GUI managment tool as well as a new availability feature known as Standby Continuous Replication (SCR).

Please grab it here: http://www.microsoft.com/downloads/details.aspx?FamilyId=44C66AD6-F185-4A1D-A9AB-473C1188954C&displaylang=en.

Harold Wong