Quick History, I took over a client who was using gmail, they originally had exchange 2010 that crashed, they restored some mailboxes and migrated to GMAIL. 2 years I am moving this group back to exchange 2010. I have exchange installed and removed the old server. New users work fine but once I installed exchange it brought over current users. When I go to those mailboxes I get two errors.. They are attached. I would like to remove and re add those existing users in exchange, if by deleting them will it delete them in the active directory?