Applies to: Exchange Server 2010 SP1

Topic Last Modified: 2012-07-23

Estimated time to complete: 5 minutes

The Microsoft Exchange Mailbox Replication Proxy service (MRSProxy) is installed on Exchange 2010 Client Access servers. MRSProxy facilitates mailbox moves between your on-premises Exchange organization and your cloud-based organization. MRSProxy is disabled by default, so before you can move mailboxes to the cloud-based service, you need to enable it. If you've installed more than one Exchange 2010 server with the Client Access role installed, verify that you've modified the web.config file on each Exchange 2010 server.

Learn more at: Understanding Move Requests

This topic is meant to be read as part of the Microsoft Exchange Server 2003 and Office 365 Hybrid Deployment checklist. Information or procedures in this topic may depend on prerequisites configured in topics earlier in the checklist. To view the checklist, see Checklist - Exchange 2003 and Office 365 Hybrid Deployment.

How do I do this?

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Text editor" entry in Client Access Permissions.

Do the following to enable the MRSProxy on the Exchange 2010 hybrid server.

Before you make any changes to the web.config file, make a copy of the file and store it in a safe location.
  1. On the hybrid server, open the following file with a text editor such as Notepad.

    <Exchange Installation Path>\V14\ClientAccess\ExchWeb\EWS\web.config

  2. Locate the following section in the web.config file:

    <!-- Mailbox Replication Proxy Service configuration -->




    DataImportTimeout="00:01:00" />

  3. Change the value of IsEnabled to "true".

  4. Save, and then close the web.config file.

How do I know this worked?

When you enable the MRS proxy, you'll be able to move mailboxes from the on-premises Exchange organization to the cloud-based organization. If you encounter an error when moving a mailbox, such as "The Mailbox Replication Proxy service is disabled", verify that you've correctly modified the web.config file on the hybrid server.

Having problems? Ask for help in the Office 365 forums. To access the forums, you'll need to sign in using an account that's granted administrator access to your cloud-based service. Visit the forums at: Office 365 Forums