Change Bill Usage to..................

EV 10.0.4

We have a situation where we had another domain added to our network which has now been decommissioned and the users moved into our domain.

In the Archives | Exchange Mailbox view the "Bill Usage to" still points to their account in the old domain  OLDdomain\User

This domain has now been decommissioned but the Bill usage to still shows old domain.

If the user has now left it hasn’t changed to Account Unknown (|S-1-5-21….etc)

1.  Is there any way to correct the Bill usage to pick up  the new domain if their account still exists - NEWdomain\Username

2.  Or to clear the Bill Usage to if the user no longer exists?

Thanks