The following table summarizes the different ranges for property identifiers, describing the owner for the properties in each range.
| Identifier range | Description |
|---|---|
| 0000 | Reserved by MAPI for the special value PR_NULL. |
| 0001 - 0BFF | Message envelope properties defined by MAPI. |
| 0C00 - 0DFF | Recipient properties defined by MAPI. |
| 0E00 - 0FFF | Non-transmittable message properties defined by MAPI. |
| 1000 - 2FFF | Message content properties defined by MAPI. |
| 3000 - 3FFF | Properties for objects other than messages and recipients defined by MAPI. |
| 4000 - 57FF | Message envelope properties defined by transport providers. |
| 5800 - 5FFF | Recipient properties defined by transport and address book providers. |
| 6000 - 65FF | Non-transmittable message properties defined by clients. |
| 6600 - 67FF | Non-transmittable properties defined by a service provider. These properties can be visible or invisible to users. |
| 6800 - 7BFF | Message content properties for custom message classes defined by creators of those classes. |
| 7C00 - 7FFF | Non-transmittable properties for custom message classes defined by creators of those classes. |
| 8000 - FFFE | Properties defined by clients and occasionally service providers that are identified by name through the IMAPIProp::GetNamesFromIDs and IMAPIProp::GetIDsFromNames methods. |
| FFFF | Reserved by MAPI for the special error value PROP_ID_INVALID. |
The range between 3000 and 3FFF is reserved for properties that are not related to either messages or recipients. MAPI divides this range into sub-ranges by types of object; the following table shows this further breakdown.
| Identifier range | Type of property |
|---|---|
| 3000 - 33FF | Common properties that appear on multiple objects, such as PR_DISPLAY_NAME and PR_ENTRYID. |
| 3400 - 35FF | Message store properties |
| 3600 - 36FF | Folder and address book container properties |
| 3700 - 38FF | Attachment properties |
| 3900 - 39FF | Address book properties |
| 3A00 - 3BFF | Messaging user properties |
| 3C00 - 3CFF | Distribution list properties |
| 3D00 - 3DFF | Profile properties |
| 3E00 - 3FFF | Status object properties |