How to Open Outlook OST Files On Mac? – Solved

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OST is an automatically generated Microsoft Outlook file from the Windows Outlook application, which cannot be directly accessed on macOS. A query has emerged from users that, due to various reasons, how to open OST files on Mac. To make it happen, we have to convert the OST file into OLM file format, which can’t be done directly. To directly open the OST file on Mac, a tool will help you named “OST Viewer”.

OLM (Open Link Mail) is a file format used by Apple’s MacOS Mail to store email data such as emails, contacts, tasks, and calendar events. OLM is not compatible with other email clients.

Why Do Users Want to Access The OST Files On Mac?

For many reasons, a user wants to view OST File on Mac. Those reasons are listed further below:

  • Problem with Outlook Exchange Server: You might be required to open an OST file in case you cannot start your Outlook.
  • Switch OS: For users who want to use a new operating system or email client. Mac Mail will be convenient to access their email data.
  • Previously Deleted Outlook Account: You might have deleted your MS Outlook account and have OST file, and now you are using Mac.
  • Recover Data: The user can recover important data present in OST file. Having access to OST files ensures that we won’t lose our data.

2 Ways to Open OST Files on Mac

We will show you a manual and the professional method to view OST files on Mac. Every step of these methods is necessary to perform.

#1. Manual Method to Open Outlook OST File on Mac

The manual method is not straightforward, so to access the OST File on Mac, one must follow a two-step process.

  • Steps to convert OST to PST file
  • Steps to Import/Open PST on Mac

Below are the steps to perform, if you want to do this using manual method

 Step 1: Convert OST to PST file

  • First, open the Outlook and go to File.
  • Next, select Open & ExportImport & Export.
  • Then, opt for Export to a File from the menu.
  • After that, choose Outlook Data file (.pst) and tap Next.
  • Now, choose the email folders the user wants to export and press Next.
  • Set the destination path by clicking on Browse and click Finish.

Step 2: Import PST on Mac Outlook to View Mail

  • First, Run the Mac Outlook on the user’s device.
  • Then, go to “File” → “Import”.
  • Select “Outlook for Windows archive file (.pst)” and click Continue.
  • After that, Browse the PST file and hit the Import button.
  • Next, click finish when the import is complete.

#2. Professional Method to Open OST on Mac without Outlook

The above method described has some flaws and is time-consuming. Instead of the manual method, you can use the OST File Viewer, which is a reliable and efficient solution. It allows you to view your Outlook OST file without using the Outlook application. User can easily access their OST files including emails, tasks, contacts, and events on the calendar. Additionally, it allows you to save your OST files in other formats and email clients. To know how this tool works, see the below steps.

Steps to Open OST on Mac without Outlook

  • First, download and run the OST file viewer on your device.
  • Then, select either from the Select folder or Single/Multiple Files to add your OST file.
  • Tap on Select filesChoose the OST file → click Open to add them.
  • Now, on your left panel, you can preview and select your email folder.

Note: If you want to convert your file into OLM file format, follow the below steps.

  • From the drop-down, select OLM.
  • Next, you have to set the destination path to save your OLM file.
  • Finally, click on the convert button to process the conversion.

Also Read: Way To Import OST Files To Gmail Accounts


In conclusion, opening an OST file on a Mac can be challenging, but it is possible with the right tools and methods. One approach involves manually converting OST to PST and then importing the PST file on an Outlook for Mac, though this can be time-consuming. Alternatively, using an OST file viewer, a specialized tool designed for this purpose, allows users to open OST files on a Mac directly without needing Outlook. This professional solution simplifies the process, saving time and effort.

About The Author:

Pradeep is a dedicated technical content writer who thrives on the intersection of technology and storytelling. With a background in engineering and a passion for writing, he brings a unique blend of technical expertise and creativity to his work. Pradeep’s articles not only educate but also entertain, making complex technical subjects approachable and intriguing for a broad audience. His work has been featured in numerous tech blogs, making him a trusted source for tech enthusiasts and novices alike.

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