Using WebDAV to read BCC information on messages (even in the Drafts folder) will not work. The “urn:schemas:mailheader:bcc” will not return the BCC information using WebDAV - this is expected behavior. If you do a GET against the message to get the MIME, then you will also not get the BCC - this also expected behavior. You will find similar limitations with Exoledb and CDOEX. Extended MAPI can get to the BCC, however BCC information gets stripped when the message hits transport (ie the message is