If you are trying to open OLM file in Gmail without Outlook for Mac isn't possible directly because Gmail doesn't support OLM format. You need a reliable converter Aryson OLM Converter. This tool lets you import OLM data straight into your Gmail account without installing Outlook.

First, install the software and add your OLM file. Preview mailbox items like emails, contacts, and calendars. Then choose Gmail or IMAP as the destination and enter your login credentials. Apply filters if needed and start the migration.

The tool maintains folder hierarchy and data integrity, ensuring no loss during transfer. It also supports bulk conversion and selective migration, making it ideal for professionals and businesses handling large OLM files efficiently and securely without technical complications.