Open the Email & Calendar tool and click Inbox - an incoming meeting invite appears there alongside your regular mail, with Accept, Tentative, and Decline buttons. Choose one and Calendar sends a reply your organizer's calendar understands, so their attendee list reflects your response.
Pick which of your connected email accounts the reply should come from before you respond. Your administrator can restrict which accounts are eligible to send invite replies, and you'll see a note if the account you'd normally use isn't allowed - choose an eligible one instead, or ask your administrator for an exception.
When you create, edit, or cancel an event you organize, Calendar sends the matching update to your attendees automatically: an invitation when you add someone, an update when details change, and a cancellation when you remove someone or delete the event entirely. You don't need to notify anyone by hand.
Open an event you organize to see each attendee's RSVP status alongside their invite. If an invite failed to send, you can resend it from the same screen.
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