hi iF migrate the exchange 2003 to Exchange 2010, both existing Exchange 2003 mailbox and new migrated Exchange 2010 mailbox should works at the same time?because VM user will be moved in the different time.thanks!
I know 2007 and 2010 would be fine. Maybe you would want to apply latest service pack, I think it does talk in the release notes that both VM users on 2003/2007 and 2010 would work fine.
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