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OAB Exchange 2010 generation - Coexistence with 2003?

We have recently upgraded our Exchange environment to 2010, but we're still running with the majority of users with 2003 mailboxes.

What's the best method to convert the OAB during coexistence?  Do I need to wait until everyone is moved or can I change the OAB generation to the 2010 servers?  

Also, most users are using Outlook 2003 as well.
1 Solution
You can move the OAB generation server to exchange 2010 bcoz there is a routing group connecto exist between these two servers and if users of exchange 2003 will query for OAB that request will be forwarded to exchange 2010 automatically.

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