Try the OLM Mail Import into Gmail Tool which has wonderful feature to convert multiple OLM files into Gmail account at once in few moments.
Download, install and run OLM Mail Import into Gmail Tool on your Windows PC and easily convert Mac OLM emails into Gmail account with emails, attachments, contacts, calendars, tasks etc. The OLM Mail Import into Gmail Tool supports multiple file naming options to manage output files in a proper manner. With this OLM Mail Import to Gmail Tool, any user can easily import OLM file to Gmail account with all details of OLM files. Demo copy also available at free of cost.
What's New
Version 10.5: N/A