OLM File Extension
Mac Outlook Database Format
- File Type olm
- Developer Microsoft
- Popularity
- Application Microsoft Outlook
- Category Data Files
- Format Binary
What is a OLM file?
Mac Outlook Database Format, identified by the OLM extension, is a Data Files type and includes 6196 files.
The Mac Outlook Database Format (OLM), created by Microsoft, is one of file format they developed, and they also built 242 programs to support them.
OLM file support extends to various operating systems, including Mac OS and Windows. When working with OLM files, you can rely on 5 programs, including Microsoft Outlook, Microsoft Office and OLM Viewer.
Programs that support OLM files
How to open a OLM file?
If you can’t open a OLM 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.
When it comes to opening and working with OLM files, Microsoft Outlook, Microsoft Office and OLM Viewer are the top choices for users. To install the updated version of Microsoft Outlook, simply go to the Microsoft site and download the installer compatible with all major platforms.
Once the process is complete, Microsoft Outlook should take over as the default application for OLM files.
Set Microsoft Outlook as the default OLM program
Changing Default Programs in Windows
- Right-click on your OLM file, then choose the "Open with" option and select "Choose another application" from the available options;
- In the pop-up window, select the Microsoft Outlook application;
- Check the "Always use this application" checkbox, and then click "OK" to apply the selected application as the default for opening OLM files.
Change Default Program on Mac
- Right click or Control + left click on the desired OLM file;
- Select "Open in application" and click "Other";
- At the bottom of the window, you will find the "Enable" menu. Default, will be set to "Recommended Programs";
- Choose "All Programs" in this menu and search for Microsoft Outlook. Check the box next to "Always open in app" to make it the default program.
Solve problems with OLM files
Rest assured, any issues with OLM files can typically be addressed with simple software adjustments. See the tips below for help.
Why does Microsoft Outlook stop responding or crash intermittently?
Microsoft Outlook crashes can be caused by outdated software. Keep your Microsoft products up to date by installing the latest updates.
Restarting your computer will solve many common problems, which is why it’s the first thing you should do before changing any settings related to the software.
What are the best practices for repairing a OLM file that has gone bad?
Use a data recovery program to open the damaged OLM file and from the menu choose "Repair" function to start the repair process. Allow the recovery process to complete, which will automatically repair the damaged data files.
What are the warning signs that my OLM file may be corrupted?
Common indications of damaged OLM data files are:
- Error messages appear during the course of working with the file;
- Editing the archive in Microsoft Outlook results in slow or unresponsive behavior;
- Opening the file results in an error or a failed attempt;
- Unexpected expansion of the total size of the OLM file;
- Opening the file in Microsoft Outlook or other programs causes them to hang or crash;
How to edit a OLM file?
To edit OLM files, it is essential to install software that supports not only viewing but also editing the data files. Online OLM editors provide limited functionality compared to full-featured software for Mac Outlook Database Format.
List of Top OLM editors 2026
Based on the criteria above, here is a selection of OLM editors you can use.
| OLM Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Microsoft Outlook | Microsoft | Windows, Mac OS | 4.8 out of 5 (43 reviews) |
Convert to and from OLM
If obstacles arise while working with a OLM file, you may convert it to formats like PS, VCF, VCARD or other similar types for smoother handling.
Keep in mind that converting a OLM file may introduce some limitations, but the original format can often be restored.