This question has probably been asked and answered in this forum but I have not been able to find a clear answer. We have Unity 4.0(5) (UM license) (seperate server) partnered to a Exchange 2003 server. We would like to migrate to an Exchange 2007 environment.
I understand that Unity 4.X does not support Exchange 2007 and since we cannot upgrade to Unity 5 at this time, we plan to keep the current Exchange 2003 server active on the network
What are the issues we need to be concerned about? Can we move all subscriber and Unity system mailboxes to the Exchange 2007 server? or should we move just the subscriber (all exchange 2003 users are also Unity UM subscribers) and keep the Unity system mailboxes on Exchange 2003?
I need to be clear if this is even a supported configuration and any potential issues or caveats when migrating to such a environment