Okay, so I know it's not supported, and I'm asking anyways because we can't wait.
For business reasons we've built a generous Exchange 2007 Cluster that we must somehow integrate with Unity so that we can move over all the users to the new environment.
I read extensively all of the posts on NetPro and otherwise on how people were successful, and the concept certainly didn't seem foreign. Today is time to go live and we've done the following:
Ran the Permissions Wizard (got no errors)
Ran the Message Store Wizard - in which we selected the servers in the new exchange clusters with (got no errors)
Verified basic email routing functionality between servers and verified manually that the permissions in ex2007 for the service accounts all appear to be there (we applied them manually to the entire server and delegated the permissions.
Any suggestions and assistance are appreciated. The winning support tip will be rewarded generously, with a minimum of my deepest gratitude and likely much much more!