https://technet.microsoft.com/en-us/library/bb125184(v=exchg.141).aspx

Use the EMC to move OAB generation to another server
--------------------------------------------------------------------------------
You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "OAB virtual directories" entry in the Mailbox Permissions topic.

1.In the console tree, navigate to Organization Configuration > Mailbox.

2.In the result pane, click the Offline Address Book tab, and then select the OAB for which you want to move the generation to a new server.

3.In the action pane, click Move.

4.On the Move Offline Address Book page, click Browse to open the Select Mailbox Server dialog box. Select the server to which you want to move the OAB generation process, and then click OK.

5.Click Move to move the OAB generation process to the new server.

6.View the status of the move operation. The wizard will move the generation of your OAB to the new server and copy the existing files for the OAB to the new server. Click Back to make configuration changes.

7.On the Completion page, review the following, and then click Finish to close the wizard:
A status of Completed indicates that the wizard completed the task successfully.
A status of Failed indicates that the task wasn't completed. If the task fails, review the summary for an explanation, and then click Back to make any configuration changes.
8.Click Finish to close the wizard.

Use the Shell to move OAB generation to another server
--------------------------------------------------------------------------------
You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "OAB virtual directories" entry in the Mailbox Permissions topic.
This example moves the OAB generation process to SERVER01 for the OAB MyOAB.

Copy
Move-OfflineAddressBook -Identity "My OAB" -Server SERVER01