Addin extra properties to MAPI messages

Question

Hi!
On msdn website http://msdn.microsoft.com/de-de/library/cc765570.aspx following is written:
"MAPI Property Overview:...Clients can define properties to describe new message classes, and service providers can define properties to expose the unique features of their messaging system."
I ve been trying to add custom properties to MAPI messages, send and receive them. the problem is by receiving i get the error code 0x40380.
Inside my GetProperties() method the pProp parameter should have in its Value.l field 5, but it has l = 0x8004010f???
While sending the HRESULT is ok. Is it really possible to define custom properties and to receive them?
Ive defined my own PropertyTag as the following:
#define PROP_TAGEVO(ulPropType,ulPropID)    ((((ULONG)(ulPropID))<<16)|((ULONG)(ulPropType)))
#define PR_MESSAGE_FLAGSEVO                    PROP_TAGEVO( PT_LONG,        0x0081)
        void SetProperties()
            const int nProperties=1;
            SPropValue props[nProperties] = {0};           
            /*props[0].ulPropTag=PR_ORIGINATOR_DELIVERY_REPORT_REQUESTED;
            props[0].Value.b = (unsigned short)true;*/
            props[0].ulPropTag=PR_MESSAGE_FLAGSEVO;
            props[0].Value.l = (LONG)5;
            HRESULT hr = m_pMapiMessage->SetProperties(nProperties, props);
in MapiMessage.cpp SetSproperties Method:
HRESULT CMapiMessage::SetProperties(ULONG valueCount, SPropValue* lpProp)
    if (!m_lpMessage)
        return E_FAIL;
    return m_lpMessage->SetProps(valueCount, lpProp, NULL);
...SetProps() is the MAPI method.
My GetPToperty method:
void GetProperties()
            LPSPropValue pProp;
            HRESULT hr = m_pMapiMessage->GetProperty(PR_MESSAGE_FLAGSEVO, pProp);
            BOOL bRead = ((pProp->Value.l & MSGFLAG_READ) == MSGFLAG_READ);
automation eng. in programming

Answer 1

Hello Evren,
As far as I know you can define transmittable user properties in range 0x8000 to 0xFFFF (user-defined Name-to-id mapped property). The
Property Identifier Ranges page in MSDN provides the following information:
8000 - FFFE
Properties defined by clients and occasionally service providers that are identified by name through the IMAPIProp::GetNamesFromIDs andIMAPIProp::GetIDsFromNames methods.
Be aware, the property should be defined on the target Inbox folder.