Upgrading Exchange 2010 to 2013

Upgrade from Exchange 2010 to Exchange 2013

5 out of 28 rated this helpful - Rate this topic Topic Last Modified: 2013-03-29 Microsoft Exchange Server 2010 and Exchange Server 2007 have multiple server roles: Client Access, Mailbox, Hub Transport, and Unified Messaging. With Exchange Server 2013, we reduced the number of server roles from four to two: the Client Access server role and the Mailbox server role. Unified Messaging is now considered a component or sub-feature of the voice-related features that are offered in Exchange 2013. (For more details about the changes, see “Exchange 2013 architecture” in What's New in Exchange 2013.) When you're upgrading your existing Exchange 2010 organization to Exchange 2013, there's a period of time when Exchange 2010 and Exchange 2013 servers coexist within your organization. You can maintain this mode for an indefinite period of time, or you can immediately complete the upgrade to Exchange 2013 by moving all resources from Exchange 2010 to Exchange 2013, and then decommissioning the Exchange 2010 servers. You have a coexistence scenario if the following conditions are true:

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Exchange 2013 is deployed in an existing Exchange organization. More than one version of Microsoft Exchange provides messaging services to the organization.

You can't upgrade an existing Exchange 2003 organization directly to Exchange 2013. You must first upgrade the Exchange 2003 organization to either an Exchange 2007 or Exchange 2010 organization, and then you can upgrade the Exchange 2007 or Exchange 2010 organization to Exchange 2013. We recommend that you upgrade your organization from Exchange 2003 to Exchange 2010, and then upgrade from Exchange 2010 to Exchange 2013. Warning: You need to remove all instances of Exchange 2003 from your organization before you can upgrade to Exchange 2013. You can migrate all your Exchange 2003 mailboxes to Exchange Online. For more information about this approach, see Mailbox Migration to Exchange...