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The following are the item-level objects defined in the Outlook object model:
AppointmentItem Object
ContactItem Object
DistListItem Object
DocumentItem Object
JournalItem Object
MailItem Object
MeetingItem Object
NoteItem Object
PostItem Object
RemoteItem Object
ReportItem Object
SharingItem Object
StorageItem Object
TaskItem Object
TaskRequestAcceptItem Object
TaskRequestDeclineItem Object
TaskRequestItem Object
TaskRequestUpdateItem Object