We just Upgraded to CCM and Unity 5.x, We have all our mailboxes in Exchange 2003, but we also have Ex 2007 installed and ready for use to move mailboxes to. Everything it working fine as far as voicemail. The Unity box has the exchange tools for 2003 installed (sp2).
When I move my mailbox to a 2007 mailstore, the Web GUI sees the new mailstore, I can go through the motions of leaving a message, but no message appears in my mailbox, and when I attempt to check message, I get an error regarding my messages not being available.
Do I need to install the Ex 2007 utilities on the Unity server, and if I do, will the 2003 mailboxes still be accessible?