What is OLM File Extension ?

OLM file came with the introduction of outlook 2011 for Mac. OLM files are the file format of Outlook for Mac for storing local data of outlook.

The file is widely used for MS Outlook to store the data including Contact, Messages, Emails, Calendar, and much more.

Organization: Microsoft
Category: Database
Supportive Apps: Ms Outlook 2011
MIME Type: Application/octet-stream

Note: This OLM stores its data in an individual database file. Initially, the email program does not store data in the OLM file format.

Full-Form of OLM File

'OLM' stands for Outlook for Mac

Size of OLM

The capacity of the OLM file format is unknown but users believe that OLM doesn’t hold more than 2 GB databases.

Location of OLM file

OLM file is saved automatically in documents.

Database file: ~/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/

Storage folder: ~/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/DataRecords

How to create an OLM file in Outlook 2011 for Mac?

  1. Launch Outlook 2011 email application on your system and then go to File → Export
  2. An Export wizard will automatically get open in front of you where you have to choose the items that you want in the OLM file. After finishing up with the entire mailbox selection, click on the Right arrow to continue
  3. Select No, do not delete items option from the current screen, and hit on Right arrow
  4. Now, the Save dialog box will appear on the screen which you have to mention the OLM file name and location where you want to locate the exported OLM file. Click on the Save button to Continue
  5. After completing the whole commands procedure, you can now see a live report to create an OLM file in Outlook 2011 Mac
  6. Once the whole process is completed, click on the Done button and open the OLM file that you have created from the Mac Outlook email program

How to Open and view OLM file

OLM file can be opened by using these methods:

Tools to open OLM File

The difference between a PST and OLM file

Most people already know that Outlook has different versions on Mac and Windows. Microsoft provides Outlook for email programs and Mac for Apple users. The one & only difference between a PST and OLM is that an OLM file is created by Mac Outlook and a PST file is introduced from Windows Outlook.

A Guide about OLM folder with its Error

Outlook for Mac email is a professional platform that has many advanced features, sometimes the OLM file can cause errors and the user will face any issue while accessing the file.

The most common error that is ‘17897’.

The users will face an error when they will send a message from Outlook and the process will be incomplete because of the server authentication. If the problem is not with the ‘Server Authentication’ then, the only reason is with the OLM file.

The user can resolve the problems by the methods given below:


OLM is a very popular database file for Mac Outlook users. The functioning of the other outlook file format is similar and the user can learn the OLM file extension in just a few minutes.

Want to Move Outlook OLM Files?

RecoveryTools OLM Migrator, can be satisfied with the accuracy of recovered email items by showing the tree structure of individual mailbox items in software window. The program displays the name of the OLM file with email elements. Switching from one email client to another is common these days, but it's not that easy.

OLM File Extension - Related Solution

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