We are migrating to a new child domain of a new forest. In the first phase of the move we are migrating our Exchange cluster. The plan was to install our Unity server into the new domain two weeks before we actually cut over our users. We are restoring mailbox data to the new Exchange cluster and installing Unity to partner with this new Exchange install. Two weeks later right before the final user cutover we will be deleting all users and restoring the accounts again to update mail data. My question is how will Unity take this deleting and rebuilding the mailboxes? The SIDs will change when we make this second restore, but the accounts will be the same.
I am thinking this will not work judging from Unity's prerequisites for installation.
Any help or personal experience to something similar would be very much appreciated.