A calendar is visual representation of time, often charted by months, weeks, or days. Often, a calendar app will help one organize events on a calendar, and sometimes provide alerts or reminders as well.

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Acknowledging an Exchange calendar response triggers a new invitation

I have Calendar connected to an Exchange 2010 server. I created an event with several (~40) persons. When someone answers I sometimes (not always) have a notification in Calendar with an "OK" button. ...