Item Types and Message Classes

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. The following table lists the message classes and their corresponding forms.

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 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.OofTemplate.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