12. A unified messaging system for an enterprise comprising: a first computer-readable memory encoded with a computer program operable to store a message sent by a sender to a recipient in a first media type, and to deliver the message to the recipient in either the first media type or a second media type; a second computer-readable memory encoded with a computer program operable to detect that a telephone number and a time for a call is mentioned by the sender in the message; and access a schedule manager of the recipient and determine availability of the recipient to conduct the call to the telephone number at the proposed time.
15. The unified messaging system of claim 12 wherein the message comprises an email message or a voicemail message.