Item types and message classes [Outlook 2003 Forms Help]

The type of an item is defined by its Type property. The message class for an item is defined by its MessageClass property.

Message class ID	Item type is used to
IPM.Activity	Create journal entries.
IPM.Appointment	Create appointments.
IPM.Contact	Create contacts.
IPM.DistList	Create distribution lists
IPM.Document	Create documents.
IPM.OLE.Class	Create the exception item of a recurrence series.
IPM	If the specified form cannot be found.
IPM.Note	Create e-mail messages.
IPM.Note.IMC.Notification	Create a report from the Internet Mail Connect (the Exchange Server gateway to the Internet).
IPM.Note.Rules.Oof.Template.Microsoft	Show out-of-office templates.
IPM.Post	Post a note in a folder.
IPM.StickyNote	Create a note.
IPM.Recall.Report	Create a message recall report.
IPM.Outlook.Recall	Retrieve sent messages from recipient Inboxes.
IPM.Remote	Represent a Remote Mail message header.
IPM.Note.Rules.ReplyTemplate.Microsoft	Edit rule reply templates.
IPM.Report	Report item status.
IPM.Resend	Resend a failed message.
IPM.Schedule.Meeting.Canceled	Send meeting cancellations.
IPM.Schedule.Meeting.Request	Create meeting requests.
IPM.Schedule.Meeting.Resp.Neg	Create decline meeting responses.
IPM.Schedule.Meeting.Resp.Pos	Create accept meeting responses.
IPM.Schedule.Meeting.Resp.Tent	Create tentative meeting responses.
IPM.Note.Secure	Send encrypted notes to other people.
IPM.Note.Secure.Sign	Send digitally signed notes to other people.
IPM.Task	Create tasks.
IPM.TaskRequest.Accept	Create accept task request responses.
IPM.TaskRequest.Decline	Create decline task request responses.
IPM.TaskRequest	Create task requests.
IPM.TaskRequest.Update	Create updates to requested tasks.