Quick way to clear Calendar notifications? For some reason, for exchange accounts, if I accept/deny calendar invitations on one computer, it would still stay as an alert on my other computers. The alert would not ask me to accept/reject, instead it would just ask me to dismiss it with an "ok" button. It's super annoying because that means I have to click "ok" for each calendar invite for each computer I have. 

Is there a way to fix this or at least a quick way to dismiss all incoming event that have already been accepted?
Hold down the alt key when you have the invitations list in view.

All the OK buttons will change to Ok All and all the  Accept buttons will change to Accept All

Clicking the Ok All will clear the invitations with just the OK All.

The other buttons do not change annoyingly. As I would like Decline All