Unenlisting from active transaction using SQLOLEDB provider of MDAC 2.6 release against SQL Server 7.0 causes hang and drain abort entry

#define UNICODE
#define _UNICODE
#include <windows.h>
#define DBINITCONSTANTS
#define INITGUID
#include <stdio.h>
#include <stddef.h>
#include <tchar.h>
#include <atldbcli.h>
#include <txdtc.h>
#include <xolehlp.h>

class CShippers
{
public:
	long m_ShipperID;
	CHAR m_CompanyName[80];
	CHAR m_Phone[20];

	BEGIN_COLUMN_MAP(CShippers)
		COLUMN_ENTRY(1, m_ShipperID)
		COLUMN_ENTRY(2, m_CompanyName)
		COLUMN_ENTRY(3, m_Phone)
	END_COLUMN_MAP()

};


int main(int argc, char* argv[])
{
	
	USES_CONVERSION;
	HRESULT hr = NULL;

	CoInitialize(NULL);

	CDataSource connection;
	CSession session1, session2;
	CCommand<CAccessor<CShippers> > shippers1, shippers2;
	const char SQL[80] = "select shipperid, companyname, phone from shippers";

	ITransactionDispenser *pTransactionDispenser = NULL;
	ITransactionJoin * pITransactionJoin1;
	ITransactionJoin * pITransactionJoin2;
	ITransaction * pITransaction;
	
	hr = DtcGetTransactionManager(NULL, NULL,
			IID_ITransactionDispenser, 0, 0, NULL,
			(void**) &pTransactionDispenser);
	
	hr = pTransactionDispenser->BeginTransaction (
			NULL,		// Controlling IUnknown
			ISOLATIONLEVEL_READCOMMITTED,	// Isolation level
			0,				// Isolation Flags
			NULL,			// Reserved
			&pITransaction);	// Ptr to the Transaction Object



	CDBPropSet dbinit(DBPROPSET_DBINIT);
	dbinit.AddProperty(DBPROP_INIT_CATALOG, L"northwind");
	dbinit.AddProperty(DBPROP_INIT_DATASOURCE, L"YourServer");
	dbinit.AddProperty(DBPROP_AUTH_USERID, L"sa");
	dbinit.AddProperty(DBPROP_AUTH_PASSWORD, L"");


	hr = connection.OpenWithServiceComponents("SQLOLEDB", &dbinit);

	hr = session1.Open(connection);
	hr = session2.Open(connection);

	hr = session1.m_spOpenRowset->QueryInterface(IID_ITransactionJoin, (void**) &pITransactionJoin1);
	hr = session2.m_spOpenRowset->QueryInterface(IID_ITransactionJoin, (void**) &pITransactionJoin2);

	hr = pITransactionJoin1->JoinTransaction((IUnknown*) pITransaction, ISOLATIONLEVEL_READCOMMITTED, 0, NULL);
	hr = pITransactionJoin2->JoinTransaction((IUnknown*) pITransaction, ISOLATIONLEVEL_READCOMMITTED, 0, NULL);


	hr = shippers1.Open(session1, SQL, NULL, NULL, DBGUID_DBSQL, true);
	hr = shippers2.Open(session2, SQL, NULL, NULL, DBGUID_DBSQL, true);

	hr = shippers1.MoveFirst();
	hr = shippers2.MoveFirst();

	shippers1.Close();
	shippers2.Close();

	pITransactionJoin1->Release();
	pITransactionJoin2->Release();

	session1.Close();
	session2.Close();

	connection.Close();

//	hr = pITransaction->Commit( 0, XACTTC_SYNC_PHASEONE, 0 );
	pITransaction->Release();
	pTransactionDispenser->Release();

	
	return 0;
}