Calendar Liberator
A browser extension that frees your work calendar from Outlook: it reads the events shown by Outlook on the web and exports them to a standard .ics file, ready to import into the calendar app you already use. Your work meetings then show up on your phone next to your personal appointments, without enrolling the device in company MDM.
It asks for no password, uses no Microsoft API and has no server: everything happens in the browser, on the Outlook session you already have open. The export covers four weeks, from last week to the next three, with the right timezone and daylight saving time for every event.
Instead of downloading it, you can publish the file to a private address and subscribe your phone or computer calendar to it, which from then on updates by itself. The export is always one-way: nothing is ever changed in Outlook.
Available for Firefox, Chrome and Edge, it is open source. The full setup, step by step, is explained in this article.
Besides the download, the calendar can be published to a private address that iPhone, Mac and Google Calendar subscribe to, and from then on they update by themselves. Support also arrives for outlook.cloud.microsoft, Outlook's new Microsoft 365 domain, and the full setup guide comes out on the blog.
Calendar Liberator is published on Microsoft Edge Add-ons, Firefox Add-ons and the Chrome Web Store.
I develop Calendar Liberator in my spare time, for my own use, and keep refining it until it is ready to publish, once I realize that several colleagues and friends have the same need.