The MHS-DS Working Group works on issues relating to Message Handling Services use of Directory Services. The message handling services are primarily X.400, but issues relating to RFC 822 use of Directory and Directory support for RFC 822 and X.400 interworking are in the scope of the group. Directory and Directory Services refer to the services based upon the CCITT X.500 recommendations and additional ISO standards, stable implementation agreements, and RFCs, as specified by the OSI-DS Working Group. The major aims of the MHS-DS Working Group are: 1. Define a set of specifications to enable effective, large-scale deployment of X.400. 2. Study issues associated with supporting X.400 communities which lack access to X.500 Directory, and define requirements for tools which: (a) extract information from the X.500 Directory for use by non-X.500 applications, and (b) upload information into the X.500 Directory. 3. Coordinate a pilot project which deploys MHS information into the X.500 Directory and uses it to facilitate mail routing and address mapping. The results of this pilot will be documented, and experience gained from the project will be fed back into the Internet specifications created by the working group.