You can also utilize CubexSoft OLM File Converter Tool to convert OLM emails, contacts, calendars, and other items to PST, PDF, EML, MSG, MBOX, CSV, ICS, HTML, Thunderbird, Gmail, IMAP, Office 365, etc. Also, there is no file size restrictions, one can easily import any number of Mac Outlook OLM files at once without facing any problem. It supports entire editions of Mac OS & Windows OS. Download a free demo pack of the app.

Visit here- https://www.cubexsoft.com/olm/