Live Communications Server 2005 for developers

References

Microsoft Office Communicator Web Access AJAX Service SDK 1.0
Download documentation of the Communicator Web Access AJAX Service API (application programming interface) and sample applications that use the API. You can use the SDK to programmatically access the functionality of your Live Communications Server and Communicator Web Access deployments.
Live Communications Server 2005 SP1 Interdomain Federation Profile
Get all the information required to implement a federated interface with a Live Communications Server 2005 SP1 deployment in order to enable federated presence and IM scenarios.