Library /sys$common/syshlp/mailhelp.hlb DIRECTORY, Qualifiers, /START  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /START=start-point

    Indicates the first message number you want to display. For
    example, to display all the messages beginning with number three,
    enter the command DIRECTORY/START=3. Use the /START qualifier
    with the /FOLDER qualifier to indicate the first folder name you
    want to display. For example, to display all the folder names
    alphabetically following PLEAT, enter the command line DIRECTORY
    /START=PLEAT/FOLDER.