VMS Help EXCHANGE, /NETWORK, Qualifiers, /MODIFIED  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Modifies the time value specified with the /BEFORE or the /SINCE
    qualifier. The /MODIFIED qualifier selects files according to
    the date on which they were last modified. This time qualifier
    is incompatible with the /BACKUP, /CREATED, and /EXPIRED
    qualifiers, which also allow you to select files according to
    time attributes. If you do not specify any of these four time
    qualifiers, the default is the /CREATED qualifier.