How to Convert OST to EMLX Format- Step-by-Step Guide

Written By
Mohd Kaif

Updated on
August 11th, 2025

5 minutes Read
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Summary: If you have used Outlook on Windows and Apple Mail on Mac simultaneously, data management would be difficult. Also, you may often need to convert OST to EMLX for this purpose. Where Outlook creates an OST file to store data, Apple Mail supports EMLX to import it. However, these formats are not compatible with the platforms directly. But here is a guide that may help you. Although there is no proper manual method to perform the conversion, you can use MacSonik OST to PST Converter. This direct solution saves your time as well as prevents data loss.

Popular Scenarios to Convert OST Files to EMLX

These two files are poles apart in terms of features; however, there are many scenarios when one needs conversion:

  • To migrate emails from Windows Outlook to Apple Mail.
  • The company may switch from the Windows system to macOS.
  • While accessing archived Outlook emails on a Mac system.
  • Also, to recover data from an orphaned OST file on a Mac system. 
  • Conversion is required to share Outlook emails with a Mac-compatible platform user.

But, is this easy to convert two incompatible formats? Truly, no.

Why Can’t We Try to Manually Convert OST to EMLX?

Experts do not recommend even trying the manual method to transfer data from Windows Outlook to Mac. This is because of the following reasons:

  • The file format compatibility issue is the primary one. Both OST and EMLX have different algorithms to store data.
  • Also, it is because Apple Mail cannot read Outlook OST files natively. 
  • Even though a manual method exists, it would be a lengthy process involving different email clients in the process.
  • Often, this creates a mess and disrupts the formatting of the OST file. It might also skip migrating attachments.
  • If your OST file is corrupt, one more process is added to it, that is, recovery. Even leads to a more complicated conversion.

So, better to go for a tested and trusted solution, like using professional software. 

Do the Following Before Conversion

Also, the issues mentioned above can be addressed with the following measures:

  • Create a backup of your OST file before you convert OST into EMLX.
  • In addition, ensure enough storage space on your Mac for converted files.
  • Know whether the OST file you are converting is orphaned or not.
  • Importantly, create a plan and decide if you need to export a full mailbox or selectively.

All these measures will help you in choosing the appropriate procedure, keeping data safe.

How to Convert OST to EMLX Without Data Loss?

Professionals trust using MacSonik OST Converter, eliminating hours of manual efforts. This is the best choice you can make to convert Outlook OST to EMLX. Whether your OST file is orphaned or linked, it converts all of them. Moreover, you can add as many OST files as this tool can process in bulk. It has no risk of data loss, as the process is smooth throughout. 

 

Additional features of the tool include: 

  • Can convert OST to PST, PDF, MBOX, and other formats too.
  • Supports OST files of all sizes and is still fast in processing.
  • Does not require Outlook or Apple Mail installation for conversion.
  • Has a user-friendly interface and is compatible with all macOS versions. 
  • You do not have to use both Mac and Windows systems together for conversion.

Quick Steps to Convert OST to EMLX

Note: To perform conversion on a Mac, transfer the OST files in Finder. 

 

Follow the hassle-free process given below for conversion:

  1. Download Mac OST Converter on your Mac system.
  2. Install the software and run it to proceed.
  3. From Finder, choose OST files and add them to the tool.
  4. Click Next, preview the data saved in OST, and move forward.
  5. Choose the saving format, EMLX, from the list of file formats.
  6. For selective data conversion, apply built-in features as well.
  7. Locate the saving folder for the output EMLX file. Click on Convert.

All your OST files’ data is now saved in EMLX format at the designated path.

Also Read: How to Convert OST to MBOX on Mac?

Conclusion

This blog suggests the best practices you need to do for conversion, safeguarding OST file data. Although no manual method is provided, the professional software is enough for your requirements. You can test all the features described using the free demo version available on the official website. No matter which solution you choose, make sure you have a backup of your files before initiating conversion. This is necessary for the additional security of your important data.

Frequently Asked Questions

Q1. Can I use OST on Outlook for Mac?

Ans- No. A Mac system, or any email client except Exchange and Outlook, does not support OST files. So, to open OST file on Mac, you first need to convert the OST into a Mac Outlook-compatible format, OLM.

Q2. What is the best OST Converter on Mac?

Ans- MacSonik OST Converter is the professional, trusted solution to convert OST files on Mac. Its bulk file handling, fast processing, and Mac supportability make it the best choice. Moreover, anyone with minimum technical knowledge can operate it. 

About The Author:

Mohd Kaif is an experienced technical content writer who specializes in researching and presenting dependable solutions to user problems. He offers practical guidance on email migration, data backup, and file conversion for users of all skill levels.

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