If you are searching for a method to export Outlook mailbox PST to OLM file, then use professional Outlook PST Converter software. It is one of the best tools to export multiple Outlook emails to Mac Outlook .olm file format including all emails, contacts, calendars, tasks, and other items along with attachments. It has a very simple GUI, both technical and non-technical users can easily handle and use this software without having technical knowledge. There is no file size limitation, one can migrate a large PST files into OLM file format without any problem. It was suitable for all the latest and below versions of MS Outlook, and Windows OS including Windows 11. You can also try the free demo version of the software and export 25 Outlook mailbox PST to OLM file without any cost.