OAB File Extension
Offline Address Book
- File Type oab
- Popularity
- Application Microsoft Outlook
- Category Settings Files, Data Files
What is a OAB file?
Files with the OAB extension are associated with Offline Address Book and are categorized as Settings Files and Data Files, making up 7386 files.
OAB files are supported by Windows and Mac OS. When working with OAB files, you can rely on 2 programs, including Microsoft Outlook and Microsoft Office.
Programs that support OAB files
How to open a OAB file?
If you can’t open a OAB file, it is usually because the necessary software is missing. To resolve the issue, select the right program from the list for your operating system. Then go to the official website of the developer, download the software, and install it.
Microsoft Outlook and Microsoft Office stand out as the preferred programs to manage OAB files effectively. To get the latest version of Microsoft Outlook, open the Microsoft website where a universal installer for all operating systems is available.
When you finish installing Microsoft Outlook, the system will automatically launch OAB files with it.
Set Microsoft Outlook to open OAB by default
Change default apps on Mac
- Right-click or use Control + Left-click on the desired OAB file to access the file’s context menu;
- Choose "Open in Application" and click "Other";
- At the bottom of the window, you will see the "Enable" menu. It is already set to the default option, "Recommended Programs";
- Within this menu, select "All Programs" and then search for Microsoft Outlook. Check the box next to "Always open in app" to make it the default program.
Set default programs for Windows
- Take the first step by right-clicking on your OAB file. Next, select "Open With" and then choose "Choose another app" from the available options;
- Find the Microsoft Outlook application in the pop-up window and select it as your preferred program;
- Select the "Always use this application" check box and click "OK" to save your selection as the default application for opening OAB files.
Easy OAB Troubleshooting
When facing challenges with OAB files, simple adjustments in your software can often solve the problem. Find helpful troubleshooting guidance below.
How do I know if my OAB file has been damaged?
OAB settings files that have become corrupted may display one or more of the following symptoms:
- Error alerts occur when actions are performed on the file;
- The file exhibits poor performance during editing operations in Microsoft Outlook;
- When opening the file, errors occur or the inability to access its contents;
- Unexplained OAB file size inflation;
- Microsoft Outlook or other programs stop responding or crash when trying to handle the file;
Why does Microsoft Outlook quit or crash unexpectedly?
Lack of software updates is a possible reason behind Microsoft Outlook crash. Keep your Microsoft products up to date by installing the latest updates.
Restarting your computer is often an effective solution to resolve various common problems. Therefore, it is recommended to do so before making any changes to the software configuration.
What methods can be used to repair a damaged OAB file?
In a data recovery program, open the damaged OAB file and select the "Repair" menu option. Allow the recovery process to complete, which will automatically repair the damaged settings files.
How to edit a OAB file?
To make changes to OAB files, you need specialized software that allows both opening and editing the settings files. Online OAB editors offer fewer capabilities than applications optimized for Offline Address Book.
Best OAB Editor Software in 2026
After analyzing the criteria, we have created a list of OAB editors available for use.
| OAB Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Microsoft Outlook | Microsoft | Windows, Mac OS | 4.8 out of 5 (43 reviews) |