Confirm event attendance from the inbox
If you have an event item in the inbox, then there are two ways to confirm/reject your attendance from your inbox.
Directly without the need of displaying more details
Hover your mouse over the event in the inbox, so the 3 action buttons appear at the end of the row. And choose the one that suits you the best. Let your colleagues know if you will show up or not.
From event detail
Click on the event item in the inbox and the modal window will pop-up. You will be able to see and edit all the details of the event.
At the top of the event detail window, is located the attendance section so click on one of the three buttons and that's it!
info_outline Note that if you change your mind, and want to change your attendance again you can find the event through Search or calendar.