/sys$common/syshlp/helplib.hlb
MAIL Routines, MAIL$MAILFILE_COMPRESS, Description
 *Conan The Librarian 

    If you do not specify an input file, the MAIL$MAILFILE_
    COMPRESS routine compresses the currently open Mail file. The
    MAIL$MAILFILE_COMPRESS routine signals informational messages
    concerning the phase of the compression.
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