All of you know that Microsoft Windows 2008 R2 will be available in the end of this year! When you want to migrate to Microsoft Windows Server 2008 R2, there’s no support anymore for Exchang 2007!!
“Stand alone DC/GC can be Windows Server 2008 R2 and it is supported to have Exchange Server 2007 SP2 work against these DC/GCs.
There is NO support for any Exchange Server 2007 SP2 components (any roles, including admin tools) installed on Windows Server 2008 R2. Exchange Server 2007 SP2 will not even install on it – the pre-req check will fail during installation.”
So when you’re planning to upgrade to Microsoft Windows 2008 R2, keep in mind that you not upgrade your Exchange 2007 environment!