The "Nickname Settings" in the preferrences of a GW system ... if I activate for moves, says I can set it to max. 365 days or "0" to never remove it. It also says that it keeps the old name and Post Office name.

My question is ... is this Nickname dependant on the "old" Post Office sticking around ? After I move all users off of this "old" Post Office, I want to delete it.