You can setup a Rule to play a sound for a email account attached to the
mailbox.
To setup a rule, click on the Organize icon (with Yellow fragmenting square
blocks) on the toolbar , and click Rule Wizard on the top right hand (for
Outlook XP). Once you are in Rule Wizard, you could setup a rule for a
specific email account that is associated with a mailbox, and to play a
sound (you could select any WAV sound files).
Srini Iyer