What is an OLM file?
An .OLM file is a Mac Outlook Database File. Microsoft created this file format for the Microsoft Outlook for Mac application. It stores local data like emails, contacts, calendars, and tasks. The file acts as a backup or archive. It allows users to transfer their email data to a new computer or keep local copies of their inbox.
How to open OLM files?
You can open an .OLM file natively using Microsoft Outlook for Mac. The software imports the data back into the application. However, Windows versions of Outlook do not support this format directly. Windows users often need third-party conversion tools to change the file to a .PST file. Users can also use command-line tools like unzip to extract the contents, because the underlying structure is a compressed archive.
Software and tools
The main software for this file is Microsoft Outlook for Mac. If you do not have a Mac, you can use specialized email migration software. Some users extract the internal files manually with archiving tools like 7-Zip or WinRAR.
Inspecting with viewer.online
viewer.online/olm analyzes .OLM files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. If an .OLM has multiple possible meanings, viewer.online/olm identifies the actual format of the user's file.
Summary
Because .OLM files use the known ZIP format, viewer.online/olm can safely open and display them online, eliminating compatibility problems.