If you recieve the message "mailbox locked" then the password was incorrectlyentered too many times.
To reset your password 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

As far as setting up your Mailbox, press your open mailbox key or press feature 981.
When prompted to enter your password enter the password of 0000.
The voice mail will make you change and confirm your password at this point. your password can be between 4 and 8 digits but cannot start with a 0.
after the password is changed the voice mail will make you record your name for the company directory. once the name recording is accepted, the mailbox will be at your main screen.
To record a greeting for your mail box,
"8"for admin
"2" for greetings
"1" for record
"1" for primary greeting
"'1" to record your greeting
at the tone record your greeting
"#" to end recording
after you record press 1 to listen 2 to retry or # to accept
press "rls" key when finished