https://www.nucleustechnologies.com/mac/olm-converter/screenshots.html
View Screenshots of Kernel Mac OLM Converter Tool
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https://eraser.heidi.ie/forum/threads/convert-olm-to-pdf-with-olm-converter-tool.19780/
Convert OLM to PDF With OLM Converter Tool | Eraser Forum
OLM files are used by Mac Outlook to store emails and other mailbox items. Sometimes, users may need to convert their OLM files to PDF format for archiving...
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https://www.adviksoft.com/olm/zimbra.html
OLM to Zimbra Converter - Convert OLM to TGZ File For Zimbra Client
Now import OLM to Zimbra client using Advik OLM to Zimbra Converter tool. Move Mac OLM emails to Zimbra Desktop client with attachments. Free trial available.
zimbra converterfile forolmtgzclient