An offline address book (OAB) is a downloadable address list collection that Outlook users can access while disconnected from Exchange Online. Admins can decide which address lists are made available to users who work offline.
In Outlook, click File Account Settings Download Address Book. On the Offline address book dialog box that's displayed, make the following selections: Download changes since last Send/Receive: By default, this check box is selected. Unchecking this box causes a full download of the OAB. Choose address book: This drop-down list will display. Exporting the Outlook Address Book from Outlook 2013: Launch Outlook 2013 and click File Open & Export Import/Export. An “Import/Export wizard” will open, click on ‘Export to a file’ and then click on Next. An “Export to a file” window will open, select “Comma Separated Values (Windows)”. Step 2: In the Account Settings dialog box, click the Address Books tab, select an address book, and then click the Change button. Step 3: In the popping up Microsoft Outlook Address Book dialog box, click to select the address book from the Outlook Address ( Books ) box, and then click the Remove Address Book.
Open the Outlook.com Address Book (People) You won't find an address book on Outlook.com. Instead, look for People when you want to find your contacts, groups, and lists. You'll also use People to edit, add, and remove entries. You can open Outlook.com People using either the mouse or a keyboard shortcut.
Offline address books are generated every 8 hours.
For more information about address lists in Exchange Online, see Address lists.
For OAB procedures, see Offline address book procedures.
How users download offline address books
In Outlook, click File > Account Settings > Download Address Book.
On the Offline address book dialog box that's displayed, make the following selections:
Download changes since last Send/Receive: By default, this check box is selected. Unchecking this box causes a full download of the OAB.
Choose address book: This drop-down list will display the offline address books that are available to you. Depending on what an admin has configured, you might see only one value here (for example, the global address list).
Click OK. The OAB is downloaded and saved on your computer.
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Conditions that cause a full download of the OAB
Outlook Mac Download Address Book Download
There are situations where Outlook will always perform a full OAB download. For example:
There's no OAB on the client computer (for example, this is the first time you've connected to your Exchange Online mailbox in Outlook on this computer).
The version of the OAB on the server and the client don't match (a more recent version of the OAB is present on the server).
One or more OAB files are missing from the client computer.
A previous full download failed, and Outlook has to start over.
When a user has multiple MAPI profiles on the same Outlook client computer and they switch between the two profiles that both use Cached Exchange Mode, multiple full OAB downloads of the same OAB files will occur.