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. |