Did you recently move to Mac OS from Windows? Having some old important PST files that you want to transfer in Mac Outlook urgently? Wondering how to convert old PST to OLM file on Mac securely? No worries, read the segment completely and at the end of it you will be able to successfully perform the conversion of PST files to OLM with emails, contacts, calendars, and other items with 100% accuracy.

PST and OLM are the file types of the same source i.e. Microsoft Outlook. Still sometimes users want to perform the conversion between them, why?

It is true that PST and OLM are the file formats of Microsoft Outlook. And, it is also true that Outlook has two different version and these files gets generated according to it. PST stands for Personal Storage Table and is a file format of Windows Outlook. Whereas, OLM is a supported file format of Outlook for Mac. Both the file formats are known for storing user’s email messages, contacts, calendars, tasks, and other items.

Need to Transfer Old PST to OLM File on Mac

There are several Windows users who move to Mac operating system for many reasons. One of the most common reasons is change of employment. Moreover, when a user moves to Mac from Windows, initially they face a lot of difficulties. Because the GUI of Mac is little different from Windows. And users who are habitual of using Outlook on Windows will configure the same on Mac OS.  

Now, the challenge here is how to access old PST files in a new Mac Outlook.

Although, Outlook for Mac has an option with the help of users can transfer few individual PST files. But it is one-by-one process. It can be a time-consuming task if the file count is large.

That is why the best way to transfer multiple PST files in Mac Outlook is by converting them into single OLM file and then importing it into Mac Outlook.

How to Convert Old PST to OLM File on Mac?

There are two different ways to transfer PST files to OLM file, one is manual method which is totally time-consuming process and another is third party automated tool.

We will not be discussing the manual approach here because we don’t want to guide you wrong. So we are directly moving to the direct app that is certified and expert’s recommended i.e. MacMister PST to OLM Converter.

MacMister PST to OLM Converter is a wonderful conversion utility for converting multiple PST files into OLM on any macOS at once. The software allows users to convert PST folders to OLM with accurate emails, contacts, calendars, and other items. The GUI is simple and easily manageable by all professional and non-professional users. Even, the operational steps are time-saving as they are just three in total which will save the time of users and delivers accurate results in a short time.

Moreover, the application has plenty of features with the help of users can convert old PST file to OLM according to their requirements. The application is introduced with the trial edition facility with the help of users can check and analyze the complete process for free.

Working Steps to Convert Old PST to OLM File on Mac

Step 1. Download, launch, and run Mac PST to OLM Converter on macOS machine.

Step 2. You may upload the required PST files on the tool by using dual options i.e. Add File(s)/Add Folder buttons. And, click Next.

add pst files

Step 3. The application will instantly list all the files with checkboxes one by one. However, the checkbox is added so that users can do the selective conversion if they want to convert specific old PST files into OLM. Click Next.

selective pst conversion

Step 4. Click on the Select Saving Options and directly pick OLM format from the list.

saving options

Step 5. Apply OLM options according to the requirements and start the process by clicking Export.


Step 6. The conversion procedure will start and a Live Conversion Report will appear showing the ongoing conversion status of PST files.

live conversion

The tool will finish the process within seconds and then the pop-up will appear conveying process successfully completed. Click on OK and then go to Outlook for Mac email client to transfer OLM files.

Step-by-Step Process to Transfer Resultant OLM Files in Outlook for Mac

Step 1. Open Outlook for Mac email client on your Mac OS.

Step 2. Click on Tools and choose Import from the options.

Step 3. An import window will appear. Select the third option (Outlook for Mac archive file (.olm). And click Continue.

Step 4. Navigate to location where OLM files are saved. Select them and click Import.

Step 5. The import process will start and then the imported items will be invisible on the left navigation pane under On My Computer.

You can choose the required item to view the data of its files. However, you will see that the content and other details of the content are completely accurate. Even, the folder structure is also precise.


The write-up has highlighted an amazing method to convert old PST to OLM file on macOS. MacMister PST Converter for Mac is a safe and trouble-free solution that delivers quick conversion of unlimited PST files with 100% accurate results. You can download the freeware version and check the conversion for free by converting 25 PST files to OLM free of cost.

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