So I need to do an upgrade from VM to UM. Client now has Ex2k3, did not when Unity VM was originally installed. Therefore the MsgStore for VM is on the Unity server. (and might be Ex2k or 5.5, don't know)
Cisco docs suggest two methods for doing the upgrade. http://www.cisco.com/univercd/cc/td/doc/product/voice/c_unity/whitpapr/migvm_um.htm.
1) buy another server for Unity UM, install it with a new fresh copy of Unity UM. Backup all items from Unity VM server, then move the DIRT restore of the mailboxes to the Unity UM server and dump the voicemails into the exchange server.
2)if you already have your MsgStore on the Exchange server, just upgrade the licenses and run the migration tool to merge the two mailstores.
I don't have a 3rd server, so am considering whether I can move the MsgStore off of the Unity VM server to their Exchange server before I do the upgrade, this would solve the issue.
However, Cisco's only documentation regarding separating Unity and Exchange is removing the Unity part not the MsgStore. http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_upgrade_guides_chapter09186a0080205a84.html
Anyone out there do this before and can offer some advice?