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Upgrade from Exchange 2007 to Exchange 2013
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 2007 organization to Exchange 2013, there's a period of time when Exchange 2007 and Exchange 2013 servers will 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 2007 to Exchange 2013, and then decommissioning the Exchange 2007 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.
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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: |
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| 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 Online.
If your organization gradually transitions its messaging system from exExchange2k10 or Exchange 2007 to Exchange 2013, you’ll probably have to maintain more than one version of Exchange during that time.
The following table lists the scenarios in which coexistence between Exchange 2013 and earlier versions of Exchange is supported.
Coexistence of Exchange 2013 and earlier versions of Exchange Server
| Exchange version | Exchange organization coexistence |
|---|---|
| Exchange Server 2003 and earlier versions | Not supported |
| Exchange 2007 | Supported with the following versions of Exchange:
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| Exchange 2010 | Supported with the following versions of Exchange:
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| Mixed Exchange 2010 and Exchange 2007 organization | Supported with the following versions of Exchange:
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When you're ready to upgrade a mixed mode environment, upgrade each Active Directory site individually. If you have Active Directory sites with only Exchange 2010 or Exchange 2007 in them, follow the instructions for upgrade from that version for that Active Directory site. For example, if you have Exchange 2010 in Active Directory site A, follow the upgrade instructions for Exchange 2010. If you have Exchange 2007 installed in Active Directory site B, follow the upgrade instructions for Exchange 2007.
If you have Active Directory sites with both Exchange 2010 and Exchange 2007 installed, follow the upgrade instructions from both Exchange 2010 and Exchange 2007, and perform the upgrade steps required by both. For more information about upgrading to Exchange 2010 and Exchange 2007 in this scenario, see the following topics:
To help you get an overview of the Exchange 2007 to Exchange 2013 upgrade process, we’ve gathered resources related to each key task in the following table. For specific step-by-step guidance, see Checklist: Upgrade from Exchange 2007.
| Task | Topic |
|---|---|
| Learn about Exchange 2013 roles and components | |
| Install Exchange 2013 | Install Exchange 2013 in an Existing Exchange 2007 Organization |
| Add digital certificates on the Client Access server | |
| Configure Exchange-related virtual directories | |
| Move mailboxes from Exchange 2010 | |
| Configure transport components | |
| Configure and deploy UM |
