HotFax MessageCenter PRO is a voice mail solution that turns any Mac into a communications center. The utility lets you manage telephone calls and voice messages with multiple voice mailboxes and fax on demand capabilities. It comes with over 120 prerecorded greetings, as well as, naturally, the capability to customize your own. Outgoing messages can be up to eight minutes long. MessageCenter lets you set up separate mailboxes for different folks in your home or office.
Mailboxes can be password protected for privacy.
Messages can be forwarded to other mailboxes and archived for future reference. You can modify the voice mail system by simply clicking icons from an integrated window, a very Mac-like feature that I appreciated. To get your messages, all you do is click on your mailbox item. Note that the iMac and iBook don't support speakerphone functionality. However, I'm probably a dinosaur in this thinking.