Moving Exchange mailboxes from 2003 to 2010

Hello - we're running on Exchange 2003 and will be migrating all mail to a new Exchange 2010 server this weekend.  Does anyone know if there's a way to COPY my 2003 mailboxes over to my new 2010 server, without moving them?  I see instructions for moving, but not copying.  I assume a mailbox can only reside in one database at a time within a single organization?  If I have to move them, is it simply a matter fo moving them back to 2003 database, if something goes wrong and I need more time to regroup on the migration?

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Mahesh SharmaCommented:
You need to move the mailboxes.
Create a pilot group of users to be moved to Exchange 2010 & do necessary testing before moving rest of users

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there is no direct way to copy mails from one to another server.

for that you have to create dummy account on exchange 2010 server.
Create PST for Ex2003 mailbox.
Import PST to created mailbox on exchange 2010 server to work.

Note: You canno create 2 mailbox account in single exchange Env.
SeanSystem EngineerCommented:
No there is no way to Copy the mailboxes. If you are wanting to have a backup just in case you can export all the mailboxes to PST files but you shouldn't have any issues if you have all your connectors setup correctly. I would suggest getting a test account setup on 2010 and make sure everything is working such as public folders/mail flow/etc and then start moving people.
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Simon Butler (Sembee)ConsultantCommented:
Move Mailbox doesn't actually move the data - it copies and then deletes. Therefore at no time is the data at risk. If you have tested the new server then just move the mailboxes to 2010 and see what happens. If there is a problem this usually shows pretty quickly and the most common issues are easily resolved - usually routing group connector or public folder replication issues.

Of course this is why you have test mailboxes and then once that testing is complete you move your own mailbox to the new server first.

Damian_GardnerAuthor Commented:
Ok - thanks for everyone's input.  I do have a test mailbox on the 2003 server I can move, but how to test mail flow without disrupting mail coming to the production server from the Internet? Unless you just mean testing it internally?

Thanks again
Damian_GardnerAuthor Commented:
thanks for your help guys
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