Understanding the Enhanced Presence Model
Although everyone is accustomed to contacting a person by sending an e-mail message, starting an IM session, or calling a phone number, there's no knowing whether the person is available and can be reached immediately. If the IM request, e-mail message, or call goes unanswered, the user retries at a later time until she can reach the intended recipient. This trial-and-error process can be avoided if the user can determine the availability of the person she is trying to contact.
Live Communications Server 2003 introduced the capability of providing presence information of users to other users allowed to subscribe to it. From the user's presence, contacts could easily establish a communication session by ...
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