We're up **bleep**'s creek without a paddle at the moment. :) You need to have MOM 2005 to convert the AKM file to a 2005 XML file, then you can use the 2007 tools to convert it to a 2007 XML file.
My cry for help, doh!
https://forums.symantec.com/syment/board/message?board.id=106&thread.id=14247