So I wanted to comment on this:
Demystifying the CAS Array Object Part 2 and ask a question.
If you have already deployed, and all the of the Outlook clients are pointing to the local name (non Array), then go back and try to fix this, only the new users from there on out will be correctly fixed without going to each machine and updating it's profile. What if instead, you create the array, set the array, then create a new database on the same mailbox server, move the users from the old database to a new database. Would this automatically take care of the whole problem and no one would be the wiser on the client side?