Process of Converting OLM to PST Using ATS OLM to PST Converter

Switching from Outlook for Mac (OLM) to Outlook for Windows (PST) can be challenging. Since OLM and PST are not cross-compatible, users must convert their mailbox files to switch platforms.

This article covers two ways to convert OLM to PST:

A manual method using Gmail and IMAP (100% free), and
An automated solution using ATS OLM to PST Converter, ideal for fast and error-free conversion.

Whatever your need, you don’t have to look any further. The ATS OLM to PST Converter is a powerful and reliable tool that helps you convert Outlook for Mac data files (OLM) to PST format, without any loss of data or folder structure.

In this blog post, we’ll take a deep dive into how this tool works and how you can use it to convert all your mailbox items—emails, contacts, calendars, tasks, and notes—from Mac to Windows, quickly and accurately.

Let’s start with the manual process.

What is an OLM File?

An OLM file is the data file used by Microsoft Outlook for Mac. It stores emails, calendars, tasks, notes, and contacts. These files are not compatible with Outlook for Windows or Microsoft 365 directly.

Key features of OLM files:

Mac-specific format
Not accessible on Windows Outlook
Generated when exporting data from Mac Outlook.

What is a PST File?

A PST (Personal Storage Table) file is used by Microsoft Outlook for Windows. It stores the same types of data as an OLM file but is Windows-compatible.

Key features of PST files:

Works across all versions of Windows Outlook
Can be imported directly into Outlook or Microsoft 365
Portable and suitable for backup, migration, or recovery

Reasons to Convert OLM to PST

Here are some common scenarios where users need to convert OLM files to PST:

Switching from Mac to Windows
Migrating from Outlook for Mac to Outlook for Windows
Importing Mac Outlook data to Microsoft 365 or Exchange
Backing up email data in a format that is more widely supported
Sharing mailbox files across different platforms

Steps to Convert OLM to PST Using ATS OLM to PST Converter

ATS OLM to PST Converter is a professional and user-friendly software designed to help users seamlessly convert their Outlook for Mac data files (OLM) to Outlook-compatible PST format. Whether you're switching from macOS to Windows or need to access your Mac Outlook mailbox on a Windows system, this tool offers a reliable and secure solution. It supports the conversion of all mailbox components, including emails, attachments, contacts, calendars, tasks, and notes, while preserving the original folder hierarchy and metadata.

One of the standout features of ATS OLM to PST Converter is its built-in preview panel, which allows users to review mailbox content before conversion. This ensures selective export and better control over the process. The software also supports conversion into multiple formats such as PST, EML, MSG, MBOX, and HTML, making it highly flexible. It can handle large and even corrupted OLM files with ease, without the need for Outlook installation. Additionally, it includes options to split large PST files, helping users manage data more efficiently.

Read More: ATS OLM To PST Converter avilable On Microsoft Store

Follow these easy steps to convert your OLM files to PST using the ATS OLM to PST Converter:

Download and Install the Software: Visit the official ATS Software website and download the OLM to PST Converter tool. Install it on your Windows PC.
Launch the Tool and Import OLM File: Open the software. Click on the ‘Browse’ button to select your OLM file from your system.
Preview Mailbox Items: Once the file is scanned, the tool will display a preview of all your mailbox content—including emails, attachments, calendars, tasks, and contacts. You can expand folders and select items for export.
Choose Output Format (PST): Select PST as the export format. You can also choose to split the PST file into smaller sizes for easier management.
Export and Save: Click on ‘Convert’ and choose the location on your PC where you want to save the converted PST file. The software will now export the OLM data into PST format.
Import PST to Outlook (Optional): Open Outlook for Windows, go to File > Open & Export > Import/Export, and choose Import from another program or file. Select the newly created PST file and complete the import.

Done! Your Mac Outlook data is now available in Windows Outlook.

Benefits of Converting OLM to PST

Access Mac emails on Windows systems
Share mailboxes with Windows users
Use data with Microsoft 365 or Outlook.com
Backup and archive emails in a portable format
Improve compatibility and long-term accessibility

Why Should You Choose ATS OLM to PST Converter?

The ATS OLM Converter is not just a basic migration tool—it’s a comprehensive solution for users who want reliability, speed, and full control over their mailbox conversion process.

Key Features:

Converts complete OLM data: emails, calendars, contacts, notes, and tasks
Preserves original folder structure, formatting, and metadata
Allows preview of emails before export
Supports exporting to other formats like EML, MSG, MBOX, HTML, and vCard
Allows splitting large PST files
Compatible with all versions of Outlook and Windows
No Outlook required for conversion

Who is it for?

Home users migrating from Mac to Windows
IT administrators handling bulk mailbox conversion
Businesses moving to Microsoft 365
Tech support professionals recovering email data from Mac.

Final Thoughts

While Microsoft doesn’t provide a direct method to convert OLM to PST, the ATS OLM to PST Converter makes it simple and effective. Whether you're switching systems, upgrading software, or just safeguarding your data, this tool gives you full control over your Outlook migration process.

Avoid manual errors, lost attachments, and complex setups. Trust ATS Software for a professional, accurate, and smooth OLM to PST conversion.