We have an exchange 2003 which is now offline and just installed exchange 2007 sitting on server 2008. We can still put on the exchange 2003 but we cannot get the two exchange servers running simultaneously. I was wondering what's the best way to migrate the mailboxes or everything from the exchange 2003 server.
1. Only one server can be up at a time.
2. Source of migration exchange server 2003
3. Destination exchange 2007.