Moving Exchange 2000 Mailboxes

Hi

I am currently in the process of migrating a whole heap of exchange 2000 accounts from one server to another, in another country. We are fully native mode now so I am using AD to do this. Problem is I am having to search for each user individually and right click on their account in AD and them go to EXCHANGE TASKS> and then move their mailbox one by one.

Question: Is there a way of selecting multiple mailboxes with differant filters rather than going through the AD list of 40 000 users and holding down the ctrl button on the ones I want to move? Its getting tedious moving all these mailboxes one at a time.

Thanks