Determining the default message store under Windows Mobile - windows

Question

The following piece of test code runs under Windows Mobile.
It's objective is to seek out the default message store so I can get the proper account name for programmatically compiling an email.
IMAPISession *mapiSession;
HRESULT hr = S_OK;
MAPIInitialize (NULL);
IMAPITable *msgTable;
SRowSet *pRows;
IMsgStore *msgStore;
if (MAPILogonEx(0,NULL,NULL,0,&mapiSession) != S_OK)
{
// MessageBox(g_hWnd,_T("Failed to logon"),_T("Error"),0);
}
else
{
SizedSPropTagArray(3, PropTagArr) = {3,{PR_DISPLAY_NAME,
PR_ENTRYID,
PR_DEFAULT_STORE}};
hr = mapiSession->GetMsgStoresTable(MAPI_UNICODE,&msgTable);
hr = msgTable->SetColumns((LPSPropTagArray)&PropTagArr, 0);
if (!hr)
{
do
{
hr = msgTable->QueryRows(1,0,&pRows);
LPSPropValue lpProp;
lpProp = &pRows->aRow[0].lpProps[0];
// if(_tcscmp( lpProp->Value.LPSZ, _T("SMS") ) == 0 )
// break;
lpProp = &pRows->aRow[0].lpProps[0];
if (lpProp->ulPropTag == PR_DEFAULT_STORE)
break;
lpProp = &pRows->aRow[0].lpProps[1];
if (lpProp->ulPropTag == PR_DEFAULT_STORE)
break;
lpProp = &pRows->aRow[0].lpProps[2];
if (lpProp->ulPropTag == PR_DEFAULT_STORE)
break;
FreeProws(pRows);
pRows = NULL;
}while (!hr);
hr = mapiSession->OpenMsgStore (0,
pRows->aRow[0].lpProps[1].Value.bin.cb,
(ENTRYID*)pRows->aRow[0].lpProps[1].Value.bin.lpb,
NULL,
MDB_NO_DIALOG | MAPI_BEST_ACCESS,
&msgStore);
... BUT, fails to get the PR_DEFAULT_STORE property on a Windows Mobile device. I'm guessing Microsoft didn't implement it accurately. And so, lpProp->ulPropTag will never == PR_DEFAULT_STORE. It's always 0000.
Has anyone had success getting PR_DEFAULT_STORE using MAPI under Windows Mobile?
Is there another way of the determining the default message store?