If you have a Microsoft Exchange account set up on iPhone with Calendars enabled, you can receive and respond to meeting invitations from people in your organization. When you receive an invitation, the meeting appears in your calendar with a dotted line around it. The
icon in the lower-right corner of the screen indicates the total number of new invitations you have, as does the Calendar icon on the Home screen.

Tap a meeting invitation in the calendar, or tap
to display the Event screen and tap an invitation.

Tap “Invitation from” to get contact information for the meeting organizer. Tap the email address to send a message to the organizer. If the organizer is in your contacts, you can also tap to call or send a text message.
Tap Attendees to see the other people invited to the meeting. Tap a name to see an attendee’s contact information. Tap the email address to send a message to the attendee. If the attendee is in your contacts, you can also tap to call or send a text message.
Tap Alert to set iPhone to sound an alert before the meeting.
Tap Add Comments to add comments in the email response to the meeting organizer. You comments will also appear in your Info screen for the meeting.
Notes are made by the meeting organizer.
Tap Accept, Maybe, or Decline.
When you accept, tentatively accept, or decline the invitation, a response email that includes any comments you added is sent to the organizer.
If you accept or tentatively accept the meeting, you can change your response later. Tap Add Comments if you want to change your comments.
Exchange meeting invitations are also sent in an email message, which lets you open the meeting’s Info screen from Mail.
Tap the invitation.