I’ve accumulated several OLM archives from older Outlook for Mac installations, and I’m trying to figure out the best long-term way to preserve them. I don’t necessarily need everything in Outlook anymore. Some emails may need to become PDFs for records, some may need to move to another mail client, and other data may eventually need to go into Outlook on Windows.

That’s why a converter supporting several formats seems more useful than a tool designed only for OLM-to-PST. MacSonik OLM Converter supports multiple output choices such as PST, EML, MSG, MBOX, PDF, CSV and HTML, which gives you some flexibility depending on the purpose of the archive.

For example, PDF could make sense for documentation or sharing, while EML or MSG would be more suitable when individual messages need to remain usable as email files. MBOX is useful for compatible mail applications, while PST makes more sense when the destination is Outlook on Windows.

I’d also want to inspect the OLM before converting it. Older archives can contain emails, attachments, contacts, calendars, tasks and other mailbox items that shouldn’t be overlooked during migration. Selective conversion and folder preservation are therefore important to me.

There are plenty of tools claiming to convert OLM files, but I think the real test is whether the resulting files remain organized and usable afterward.

If you had several years of OLM archives to preserve, would you convert everything into one format, or keep different formats for different future uses?