File with an .OLM extension contains a database of emails (with attachments), calendar, scheduled tasks, notes, user’s contacts and Microsoft outlook application data. A database in the OLM format is specific to Mac OS system; it cannot be opened within a Windows program.

If an OLM file is damaged or any problems regarding reading it occur, the Stellar Phoenix OLM Repair tool can be used. It is a software designed to repair and recover data within an OLM file. In order to display content of an OLM file within MS Outlook for Windows type systems, it is necessary to convert it into an equivalent for Windows platform – the PST extension.