One or more OLM files can be converted into PST format at
once with this excellent vMail OLM to PST Converter
Tool. All OLM file items, including the Inbox, Contacts, Calendars, Tasks, and
Notes, can be migrated into PST format. 

To save time and effort, it enables users to convert a subset
of OLM files into PST format. After conversion, it maintains the original
structure of email while preserving the data integrity. OLM files can be
converted to PST format without installing Microsoft Outlook. 

Everyone may use this software effortlessly thanks to its
user-friendly interface. To learn about the software's features and
capabilities, use the free demo version first. 

Know more info- https://www.vsoftware.org/olm-to-pst-converter.html