User A is on the Exchange 2003 server (Exchange 2003 is the current message store for Unity).
Exchange 2007 is configured on a new server and is in the same Exchange Org. as the 2003 Server.
Can I migrate User A to the Exchange 2007 server and have the voice mail function without issue? Do I simply need to run the Permission Wizard to allow access to the message store?
I will change the partner server after migration to the exch 2007 server.
How do companies do this with thousands of mailboxes??
Thanks in advance!