.OLM File

File extension olm is associated with Microsoft Outlook for Mac, a personal information manager, which is part of Microsoft Office for Mac, developed by Microsoft Corporation.

The single olm file contains all of users Outlook folders, including the Inbox, Calendar, and Contacts. Also stores e-mail messages and other data saved by the application from an Exchange server.

Files with olm extension can be quite often found as email client databases from Microsoft Outlook for Mac. Similar to PST format in purpose

How to open:

Use Microsoft Outlook for Mac to open *.olm data files.

How to convert:

These files can probably be used for migration from one email client to another, thus basically converted.