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So you are thinking of upgrading your existing Exchange Server 2010 to the all new and improved Exchange Server 2013, and you are wondering about those lovely pitfalls that may happen? Microsoft Exchange Server 2010 and Exchange Server 2007 have multiple server roles: Client Access, Mailbox, Hub Transport, Unified Messaging, and Edge Transport.
The other system is considered the “secondary” mail store.
The following use cases must be handled to ensure email is properly delivered, presuming an Exchange to Zimbra migration.
The Split Domain configuration requires that you share the same SMTP address space between two or more different e-mail systems.
Microsoft recommends that you upgrade your organisation from Exchange Server 2003 to Exchange Server 2010, and then upgrade from Exchange Server 2010 to Exchange Server 2013.
Exchange Server has been dependent on Active Directory since Exchange Server 2000 and this doesn't change in Exchange Server 2013.