We have created an integration with Outlook Web Apps. Outlook Web Apps is a version of Outlook provided with the Office 365 subscription. Since it's browser-based, the integration will work on both Mac and Windows. Click here for the complete installation guide.
If you don't have a store button, you're not on the latest version of Outlook for Mac. Follow these steps to get updated:
i. Go to the Help button (in the very top navigation, to the right of “Outlook”)
ii. Choose Check for Updates in the drop-down menu
iii. Update to the latest version of Outlook and come back to these steps when you’re done