Change the Default Offline Address Book
Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2
By default, when you install the Mailbox server role, a Web-based default offline address book (OAB) named Default Offline Address Book is created. You can set any OAB in your Exchange organization as the default OAB. This new default OAB is associated with all newly created mailbox databases. You can have only one default OAB in your organization. If you delete the default OAB, Microsoft Exchange doesn't automatically assign another OAB as the default. You must manually designate another OAB as the default.
Looking for other management tasks related to OABs? Check out Managing Offline Address Books.
Use the EMC to change the default offline address book
You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Offline address books" entry in the Mailbox Permissions topic.
In the console tree, navigate to Organization Configuration > Mailbox.
In the result pane, click the Offline Address Book tab, and then click the OAB that you want to set as the default OAB.
In the action pane, click Set as Default. A warning appears. Click Yes to confirm that you want to set this OAB as the default OAB.
Use the Shell to change the default offline address book
You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Offline address books" entry in the Mailbox Permissions topic.
To change the default OAB, use the following syntax.
Set-OfflineAddressBook -Identity <OfflineAddressBookIdParameter> -IsDefault <$true | $false>
This example sets the OAB named My OAB as the default OAB.
Set-OfflineAddressBook -Identity "My OAB" -IsDefault $true
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