Overview

The Offline Address Book, a part of accounts housed on Microsoft Exchange Server, is referred to as OAB by abbreviation. Using the file extension helps you to keep client information including name, email address, and office address. Though it is not related to Microsoft Exchange, an OAB file can still be viewed as the name suggests. One must back up the OAB files. They receive automatic updates inside the server. MS Outlook running in cached mode updates OAB once daily.

Category

They are Data File (Address Book).

Supportive Apps

MS Outlook and MS Exchange Server

Developer

It is the tech giant Microsoft created the file extension to store contact info.

MIME Types

It has one MIME type-

application/octet-stream

Location

Location is primarily dependent on the OS you are using.

In Windows 7/8/10-

\Users\user\AppData\Local\Microsoft\Outlook

In Windows XP and Server 2003-

drive:\Documents and Settings\user\Local Settings\Application Data\Microsoft\Outlook

Versions

The tech market offers to install OAB of versions 2, 3, and 4.

The latest 4 versions of OAB have-

• Differential Patch file
• Display template file & full detail file

OAB files cannot be opened directly in MS Outlook as an individual file. Users can take the help of third-party applications to view OAB files.