I am switching from a Mac computer to a Windows system and need to transfer my existing Outlook email archive. The data was exported from Outlook for Mac as an OLM file, but Windows Outlook generally works with PST files for importing and archiving mailbox data. I want to understand the safest way to make this transition without losing important messages, attachments, or custom folders.

What makes this process confusing is that OLM and PST are not interchangeable formats. Simply copying the OLM file to a Windows computer does not make it readable as a standard PST archive. The mailbox data needs to be converted into a compatible format before it can be imported into the destination environment.

I would first confirm that the conversion method supports my source OLM file and the intended Windows Outlook version. I would also check whether it can process multiple folders, retain message timestamps and attachments, and handle a large archive without requiring manual export of individual emails. If contacts and calendar items are included in the migration, their conversion support should be verified separately.

While exploring possible solutions, I found the SysInfo Mac OLM Converter, which provides options for converting Mac Outlook data into formats such as PST and other commonly used email formats.

My plan would be to preserve the original OLM file, convert a test archive first, and open the resulting PST in Windows Outlook to inspect the folder structure and sample messages. Once the results are verified, I can proceed with the remaining data.

For anyone who has completed a Mac-to-Windows Outlook migration, which steps helped you avoid missing emails or attachments? Is there a recommended way to validate the converted PST before using it as the primary archive?

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