Old user

We had a user who left the business and the account was deleted, recently another user with the same name joined the business and the account was created with exactly the same username. The issue i have is EV can't see this account, as the username already exists in EV's DB and EV will not archive this mailbox?

I have gone into Archives and tried changing the billing usage to this user's name without success.

I'm stuck with this problem now, any pointers/help is appreciated.