What voicemail and fax software is available?

This mode is to phones what email is to computers. Messages are sent to other users by calling the voicemail system rather than the user's phone. For example, suppose two employees (Fred and Mary) are working on a project. Fred has some information that Mary should have, but doesn't want to phone her and talk to her – he just wants to give her the information. Rather than phone her, Fred calls the voicemail system, logs on with his number and password, and records a message to Mary in his own voice. He tells the voicemail system to send it to Mary by keying in her mailbox number (same as her extension) or spelling her name using Touch-tone keys. The message is immediately put in Mary's voice mailbox without her phone ever ringing. The message waiting light on her phone immediately comes on telling her there is a message. Fred can send this message just to Mary, to Mary and any number of additional employees, or to group lists which contain any number of pre-programmed names and numbers. The same message can be sent to thousands of people. Additional features are available, like marking a message urgent, private or asking for notification when the message has been picked up.