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This product allows SIP clients to exchange IM's and presence using the SIMPLE protocol. The client also allows two clients to setup audio/video sessions, application sharing, and file transfer sessions.

The product was released in two editions, Standard Edition and Enterprise Edition. The Standard Edition uses a Microsoft SQL Server Desktop Engine (MSDE) (included with the product) to store configuration and user data. Enterprise Edition uses a full version of Microsoft SQL Server (purchased separately).

New features to this version compared to the 2003 release is the ability to leverage SQL and remote user access.

Presence? Presence is conveyed as levels of availability to communicate. Levels of presence support by LCS:

Online
Busy
Do not disturb
Be right back
Away
In a Meeting