The following table describes Microsoft Exchange Server property types that are supported by MAPI.
| Property Type |
Multivalued Type |
Underlying Data Type |
| PT_APPTIME |
PT_MV_APPTIME |
Double. Interpreted as date and time. Same as OLE type VT_DATE and compatible with the Visual Basic time representation. |
| PT_BINARY |
PT_MV_BINARY |
SBinary. Counted byte array. |
| PT_BOOLEAN |
PT_MV_12 |
16-bit Boolean. 0 = FALSE, nonzero = TRUE. Same as OLE type VT_BOOL. |
| PT_CLSID |
PT_MV_CLSID |
CLSID structure. Class identifier. VT_CLSID. |
| PT_CURRENCY |
PT_MV_CURRENCY |
64-bit integer intepreted as decimal. Compatible with Visual Basic CURRENCY type. Same as OLE type VT_CY. |
| PT_DOUBLE |
PT_MV_DOUBLE |
Double. 64-bit floating point, PT_R4. Same as OLE type VT_R8. |
| PT_ERROR |
(None) |
SCODE, 32-bit unsigned integer. Same as OLE type VT_ERROR. |
| PT_FLOAT |
PT_MV_FLOAT |
32-bit floating point, PT_R4. Same as OLE type VT_R4. |
| PT_I2 |
PT_MV_I2 |
Signed 16-bit integer, PT_SHORT. Same as OLE type VT_I2. |
| PT_I4 |
PT_MV_I4 |
Signed or unsigned 32-bit integer. Same as OLE type VT_I4. Same as PT_LONG. |
| PT_I8 |
PT_MV_I8 |
Signed or unsigned 64-bit integer. Same as OLE type VT_I8. Uses the structure LARGE_INTEGER. |
| PT_LONG |
PT_MV_LONG |
Signed or unsigned 32-bit integer, PT_I4. Same as OLE type VT_I4. |
| PT_LONGLONG |
PT_MV_LONGLONG |
Signed or unsigned 64-bit integer, PT_I8. Same as OLE type VT_I8. |
| PT_NULL |
(None) |
Indicates no property value. Same as OLE type VT_NULL. Reserved for interface use. |
| PT_OBJECT |
(None) |
A pointer to an object that implements the WIN32 IUnknown interface. Similar to several OLE types, including VT_UNKNOWN. |
| PT_R4 |
PT_MV_R4 |
4-byte floating-point data. Same as OLE type VT_R4. |
| PT_R8 |
PT_MV_R8 |
8-byte floating-point data. Same as OLE type VT_DOUBLE. |
| PT_SHORT |
PT_MV_SHORT |
Signed 16-bit integer, PT_SHORT. Same as OLE type VT_I2. |
| PT_STRING8 |
PT_MV_STRING8 |
Null-terminated 8-bit character string data. Same as OLE type VT_LPSTR. |
| PT_SYSTIME |
PT_MV_SYSTIME |
64-bit integer. Date and time values in the form of a MAPI FILETIME structure. Same as OLE type VT_FILETIME. |
| PT_TSTRING |
PT_MV_TSTRING |
Set to PT_UNICODE when compiling with the UNICODE symbol; else PT_STRING8. Either the OLE type VT_LPSTR or VT_LPWSTR. |
| PT_UNICODE |
PT_MV_UNICODE |
Null-terminated wide-string data. Same as OLE type VT_LPWSTR. |
| PT_UNSPECIFIED |
(Not supported) |
Indicates that the client application does not supply the property type. Reserved for interface use. |