How to convert
OLM to PST online1. Open one of the converter links above.
2. Click Upload OLM File or the equivalent upload option.
3. Select your .olm file from your computer.
4. Start the conversion to PST.
5. Download the converted .pst file.
Important privacy tip: OLM files can contain private emails, contacts, and attachments. Online converters upload your data to an external service, so use one only if you're comfortable with its privacy and file-retention policies.
https://www.perfectdatasolutions.com/en/olm/olm-to-pst-converter.html