sQuery = "<?xml version='1.0'?>" +
               "<a:propertyupdate xmlns:a='DAV:' " +
               "xmlns:m='urn:schemas:mailheader:'>" +
               "<a:set><a:prop>" +
               "<m:subject>" + "" + "</m:subject>" +
               "</a:prop></a:set>" +
               "</a:propertyupdate>";