What is a .OAB File And How To Open It (Easy Guide)


Have you came across a file with the .oab extension, but it is a file you have never seen before? You most likely know what the file is, but you might be unsure on how to open it. In this article we will explain what .oab file extension is, how to open it and how to work with it.

What is a .OAB file?

The .OAB file extension is from Offline Address Book. The file is a data related file.

What to know

There is currently 1 software that can open the .oab file on 1 platform.

How to open a .OAB file?

Below we will show you a step-by-step guide on how to open the .OAB file on various operating systems.

How to open a .OAB file on Windows (7, 8, 10)

Below you can see a visual guide on how to open the .oab file on Windows in 4 easy steps.

1. The first step is to download the Microsoft Outlook 365 software. This software will be used for opening the file. You can also use Microsoft Outlook 365 software.

Step 2

Step 2: Locating your .OAB file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Choose “Open with”

3. In the third step right click on your file and choose “Open with”.

Step 4

Step 4: Choose the software and click ok

4. After choosing the “Open with” option, you will have an option to choose the Microsoft Outlook 365 software you have downloaded. Click on the software and click “OK”. That’s all, now you have opened your file on Windows.

Still cannot open the .OAB file?

If you cannot open the .OAB file, it is entirely possible that you are trying to open the wrong file. The .OAB file extension is similar to other file extensions such as: .oam – Adobe Systems, .oap – OutSystems, .oar – OpenSimulator Archive, .oat – Google, .ob! – Orbit Downloader. You might be trying to open the wrong file, please recheck if you are trying to open the right file extension again.


In this article you have learned how to open the .OAB file with the Microsoft Outlook 365 program on Windows.