We are migrating from Exchange 2003 to Exchange 2010. In Exchange 2003 we have 5 Mailbox Stores and in each Mailbox Store there are SMTP and System mailboxes. After moving all user mailboxes from Exchange 2003 to Exchange 2010, do we have to move all these SMTP and system mailboxes to Exchange 2010 also? Please let me know. Thank you.
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