| Item type | Description | Message class ID |
|---|---|---|
| Message | E-mail message | IPM.Note |
| Meeting request | Meeting request | IPM.Schedule.Meeting.Request |
| Delivery | Delivery receipt | REPORT.IPM.Note.DR |
| No delivery | Receipt of non-delivery | REPORT.IPM.Note.NDR |
| Read report | Read receipt | REPORT.IPM.Note.IPNRN |
| Unread report | Not-read notification | REPORT.IPM.Note.IPNNRN |
| Post | Posting note in a folder | IPM.Post |
| Note | Creating note | IPM.StickyNote |
| Contact | Contact | IPM.Contact |
| Appointment | Appointment | IPM.Appointment |
| Rss Feed | Rss Feed | IPM.Post.RSS |
| Task | Task | IPM.Task |
| Journal | Journal entry | IPM.Activity |
| Others | Other item types not listed above | All other class IDs not listed above |