We recommend setting permissions for calendar sharing in the web view of Outlook (for compatibility reasons). The changes/adjustments will then also be visible in the Outlook client on Windows and macOS as well as in Apple Mail.

To grant ETH users access to the desired calendar, please log in to https://outlook.office.com and follow the steps in the screenshot below:

Sharing your Calendar Apple Mail (not recoomended) 

You can delegate read- and optional write rights to your calendars to any person.

A. Choose in the application Calendar -> Settings [1].

B. Choose Exchange [1] -> Accounts [2] -> Delegation [3] -> Edit… [4]

C. Click + [1] then choose Name or ETH Username [2]. You can now give access to your calendar to any number of people. Set the access rights [3]. Click Done [4].

This account can be used on all computers and phones you wish. Calendars are automatically synced.