Press feature 983 the screen should say log:
enter 1020000 (default password) if you have a 3 digit intercom number, 120000 if you have a 2 digit intercom number
the display should say mbox, AA, and othr above the three soft keys
press the mbox soft key
the screen should say add, del, and chng above the soft keys
press the chng soft key
enter in the mailbox number you wish to reset the password on
press ok
the screen should say reset and next above the soft keys
press the reset soft key
press the Rls key
your password should be reset to 0000