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Exchange 2003 Migration Wizard (can I allow users to access store while importing email?)

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...

Thanks!
Dave
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MarkMichael

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Thanks for the comments guys,

Overall, I did what antioed suggested. Using groups. Although the way I did it, I ended up having to do it twice in order to import some subfolders (deleted the messages in the IMAP inbox so they woudn't come in twice and reran with just the required subfolders in the IMAP box).  In general most users wouldn't have been accessign their mailbox while I imported.  For reference though, I found the process to be pretty good and it reminded me a lot of Exmerge.  While I had used this before on SBS migrations it was the first time with IMAP folders with users hitting the system (albeit not much).

Dave