I have 3 AD forests, ForestA, ForestB, and ForestC. Each forest has Exchange 2010 with mailboxes and the associated user accounts for those mailboxes in that same forest. My goal is to move all the mailboxes to ForestC (user accounts will still live in ForestA and ForestB, just mailboxes move to forestC).
I would like to know the following migration path is possible:
1. Configure AD synchronization between ForestA and ForestC using the free Microsoft tool (IIFP?), migrate the mailboxes, and decommission Exchange in ForestA (AD user accounts that "own" those mailboxes will still stay in forest A).
2. Remove AD synchronization between ForestA and ForestC
3. Configure AD synchronization between ForestB and ForestC using the free Microsoft tool (IIFP?), migrate the mailboxes, and decommission Exchange in ForestB (AD user accounts that "own" those mailboxes will still stay in forest B).
4. Remove AD synchronization between ForestA and ForestC.
Some questions, thanks in advance for your help:
1. Is this possible?
2. Is this the best way to do it?
3. Can this be done with the free directory synchronization tool for Microsoft instead of buying the full Forefront Identity Manager tool?
4. Do I even need directory synchronization for this?
Thanks!