To import OLM to Office 365 use the Advik OLM Converter. First, install and launch the Advik OLM Converter on your system. Next, add your OLM file by selecting it from your Mac Outlook data backup. Once the file is loaded, the software will display all your mailbox folders—emails, contacts, calendars, and more. Now, choose the folders you want to migrate and select Office 365 as the saving option. Enter your Office 365 login credentials securely within the tool. Finally, click on the Convert or Export button to start the migration. The tool will transfer all selected OLM data directly to your Office 365 mailbox, keeping your folder hierarchy and attachments intact.