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| Outlook Developer Reference |
The message class for an item is defined by its MessageClass property, and is used to identify the form that should be used to display the item.
| Message class ID | Message class is used to identify a form for: |
|---|---|
| IPM.Activity | Journal entries |
| IPM.Appointment | Appointments |
| IPM.Contact | Contacts |
| IPM.DistList | Distribution lists |
| IPM.Document | Documents |
| IPM.OLE.Class | The exception item of a recurrence series |
| IPM | Items for which the specified form cannot be found |
| IPM.Note | E-mail messages |
| IPM.Note.IMC.Notification | Reports from the Internet Mail Connect (the Exchange Server gateway to the Internet) |
| IPM.Note.Rules.Oof.Template.Microsoft | Out-of-office templates |
| IPM.Post | Posting notes in a folder |
| IPM.StickyNote | Creating notes |
| IPM.Recall.Report | Message recall reports |
| IPM.Outlook.Recall | Recalling sent messages from recipient Inboxes |
| IPM.Remote | Remote Mail message headers |
| IPM.Note.Rules.ReplyTemplate.Microsoft | Editing rule reply templates |
| IPM.Report | Reporting item status |
| IPM.Resend | Resending a failed message |
| IPM.Schedule.Meeting.Canceled | Meeting cancellations |
| IPM.Schedule.Meeting.Request | Meeting requests |
| IPM.Schedule.Meeting.Resp.Neg | Responses to decline meeting requests |
| IPM.Schedule.Meeting.Resp.Pos | Responses to accept meeting requests |
| IPM.Schedule.Meeting.Resp.Tent | Responses to tentatively accept meeting requests |
| IPM.Note.Secure | Encrypted notes to other people |
| IPM.Note.Secure.Sign | Digitally signed notes to other people |
| IPM.Task | Tasks |
| IPM.TaskRequest.Accept | Responses to accept task requests |
| IPM.TaskRequest.Decline | Responses to desline task requests |
| IPM.TaskRequest | Task requests |
| IPM.TaskRequest.Update | Updates to requested tasks |