I'm in the middle of cleaning up an old Outlook archive on my Mac, and I realized I don't actually want to keep everything in Outlook anymore. Most of my emails need to end up in Gmail and a few archived folders will stay in Thunderbird. I assumed I'd have to convert everything first and then import it manually, but I started looking for a solution that could simplify the process.

During my search, I found MacSonik MSG to EML Converter, and one thing that stood out was that it isn't limited to converting Outlook MSG files into EML. It can also export to formats like PST, EMLX, MBOX, PDF, and others, which is useful if you switch email clients later.

What caught my attention most was the option to migrate MSG data directly into accounts like Gmail, Yahoo Mail, Hotmail, iCloud, and Thunderbird without depending on additional utilities. That saves several extra steps, especially when you're moving a large archive.

Another nice feature is the flexibility during conversion. If you're only interested in the email content, you can skip attachments completely, which creates much smaller backups. On the other hand, when attachments are important, they're preserved without altering the original message.

The software also converts more than just emails. Contacts, calendars, tasks, and meeting information can be processed as well, which makes it more useful for anyone moving away from Outlook completely instead of just exporting messages.

I also noticed that the application runs on both modern macOS versions and Windows, so anyone working across different systems can use the same tool. I tested the free edition first, and the 50-email-per-folder limit was enough to confirm that everything was working correctly before considering the full version.

Has anyone here migrated directly from Outlook MSG archives into Gmail or Thunderbird on a Mac? I'm interested in hearing how well the process worked compared to doing everything manually.