I have a complex question with hopefully a simple answer...
We have Unified Messaging in AD2003:
Unity 4.x servers connecting to Exch2K3 mailstores through partner A
Unity 7.x servers connecting to Exch2K3 mailsotres through partner B
The plan is to introduce Exchange 2007 (performing required schema extension) as a pilot without breaking Unity (esp. 4.x as it has most of the users).
No requirement to deliver VMs to Exchange 2007 right away, but that's coming soon.
Can we perform the schema extension necessary for Exchange 2007 without breaking production UM environment?