So now that Windows Server 2008 has been released what versions of Exchange Server can we run on it...? Well the earliest version that is supported to run on W2K8 is Exchange Server 2007 with Service Pack 1. It is not supported to run the RTM version of Exchange Server or indeed any previous version of Exchange on W2K8.
Some other key bits of information:
I understand there is some good documentation on the way to provides some guidance and best practise concerning moving to Windows 2008. I am guessing that best practise will be a combination of moving mailboxes and rolling upgrades or rebuilds and will need to be carefully planned, especially when you consider the improvements\changes in Windows 2008 clustering. Scott Schnoll describes some of the possible migration paths for standalone servers in his 'You Had Me At EHLO.....' blog.
Have a look at the following for more information on the subject:
Exchange 2007 System Requirements
Step-by-Step Guide for Migrating Settings from a Cluster Running Windows Server 2003 to a Cluster Running Windows Server 2008
Installing Cluster Continuous Replication on Windows Server 2008
So now that Windows Server 2008 has been released what versions of Exchange Server can we run on it.