Hello, I've got Exchange 2007 (CCR Cluster for Mailbox Server, NLB for HUB/CAS) running on Server 2008 SP2. If the forest was upgraded to Server 2008 R2are there any known issues with Exchange 2007?Cheers, Andy andrewDOTstoryATjameswalkerDOTbiz

Exchange 2007 SP1 w/ RU 9 and above is supported under a 2008 R2 forest. See the following supportability matrix. Scroll to section "Support Active Directory System Environments" http://technet.microsoft.com/en-us/library/ff728623(EXCHG.141).aspxTim Harrington - Catapult Systems - http://HowDoUC.blogspot.com