I would like to synchronize Microsoft and Google calendars across multiple devices, particularly Ubuntu-based. I have managed to merge the two calendars from Microsoft Outlook and Gmail on an Android device with the Outlook app. However, I have not been able to synchronize the two calendars on the Ubuntu-based systems. I have tried various combinations: The web-based Microsoft Outlook, calendar.google.com, Thunderbird's calendar and gnome-calender.
It seem not possible to get the Microsoft Outlook calendar into the Google system as far as I can determine.
For the other way, I have added a calendar (Danish "Tilføj kalender") in the web-based Microsoft owa interface. I can import an unzip .ics exported from Google, but changes in Google Calendar is not reflected in the Microsoft calendar. I have tried adding a person in the Google calendar setting with my Microsoft-based email address, but this does not seems to be accepted. I have tried to add the https://calendar.google.com/calendar/u/0?cid=... link from the Google Calendar setting to the add calendar in the web-based Microsoft system. But in vain. I am unsure if the URL format in the Microsoft settings field is correct.
The gnome-calendar has the synchronized Google calendar. I have tried to add an "Microsoft Exchange Account" for the Microsoft calendar but this does not show up.
My Thunderbird's calendar has the Microsoft calendar. I have added the "https://calendar.google.com/calendar/u/0?cid=..." link to the "Location" field in the "Edit Calendar" setting, but the Google calendar does not show.
I wonder if I am missing a combination of settings or a plugin.