I found that the easiest way is to Sync your Outlook calendar with Google calendar and use the Garmin native Calendar widget.
The Garmin calendar widget will connect to the google calendar app on your (Android) phone.
In Outlook online, you can share your calendar, This will generate an URL which you can then import into your Google Calendar (online).
Your outlook calendar will now be displayed in your google calendar.
Only issue, Google only sync the calendar once or twice a day !!! so good for read-only and long plan calendar but not real time!
Search the (VA3) forum, there are a few threads on outlook Calendar with Garmin.
I was referring outlook as outlook pc app not outlook online. I guess i cant connect connect pc app using a URL