We're looking to move Unity 4.0(2) (Unified with Exchange) from an unsupported platform, to a new MCS that has Unity 4.2 installed on it, and will be Unifying with a new Exchange server.
The issue is that the 4.0(2) box is a live system and we're trying to plan our way through the migration with minimal disruption to the some 400 users of voicemail.
The major task we can see from this is a way of migrating the 400 users of voicemail across but we're finding the DiRT documentation full of thorns (Specifically related to versions of Unity). Any clues as to which is the best way we should plan this move?
Any help greatly appreciated!