...
The admin can click on the ‘Upgrade Connection’ button themselves to go to the upgrade connection page
Wizard
...
Microsoft 365
...
Microsoft 365 is detected due to 'outlook.office365.com' in the EWS URL, verify whether the upgrade is correct and press 'Upgrade'.
After the upgrade a success message will be shown.
The linked users need to re-connect to the calendar. The active users will receive an email asking to reconnect.
...