How to open OLM file in Excel Mac? Download Mac OLM Converter Tool and directly open OLM file in Excel Mac OS without facing a single problem. The tool permits users to batch open OLM file in Excel Mac OS at once without any data loss. During the export process, it keeps all mail properties, formatting, metadata, folder structure, images, hyperlinks, attachments, etc. in the correct form. It works with all macOS, Outlook, and Win OS platforms. Moreover, the software comes with a free trial pack which permits to export the first 25 .olm files to Excel without cost.