I will be using the Exchange Migration Wizard to migrate about 30 IMAP email boxes (20 GB) into Exchange 2003. From my initial tests, it looks like the import will take 4-8 hours. My plan is to block email coming into the server during the migration (basically hold it at a 3rd party "backup" mailserver). While the Migration Wizard is importing the IMAP emails into Exchange, I want to migrate clients. Is this o?. My initial tests look like it works. I was accessing one mail box while importing a different one. But I havent' tested accessing a mailbox while I was importing it. Can anyone offer any advice on how to best manage importing email and migrating client simultaneously?
Obviously make the server multitask will mean a slower import, but I think that configuring clients for Exchange (mostly RPC/HTTPS) will help to keep users happy.
I would appreciate if anyone can relate their experience with this and the best way to minimize the impact to a business of moving to Exchange.
Points for meaningful comments...