Copy an IStorage interface to an IStream interface for ATTACH_OLE attachments

How do I copy an IStorage interface to an IStream interface?
Attachments of type ATTACH_OLE seem to require an IID_IStorage
interface.

case ATTACH_OLE:
{
LPSTORAGE pSource = NULL;
LPSTREAM pDest = NULL;
STATSTG StatInfo = {0};

hr = pAttach->OpenProperty(PR_ATTACH_DATA_OBJ,(LPIID)&IID_IStorage,0,0,(LPUNKNOWN *)&pSource);
hr = pSource->Stat(&StatInfo, STATFLAG_NONAME);

/* Copy pSource to pDest somehow, thanks forum members! */

/* Now I can read the content to file or my own buffer etc... */
hr = pStream->Read(lpBuffer, ulBufferSize, &ulRead);

}


.

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