Microsoft Office Communicator 2007 SDK

From Microsoft:

Microsoft Office Communicator 2007 introduces a wide range of new features, including enhanced presence and enterprise voice capabilities. With enhanced presence and enterprise voice, users can place computer-to-computer calls and place outbound calls to, and accept incoming calls from, traditional (PBX/PSTN) phone users.

The Microsoft Office Communicator 2007 SDK enables quick integration of Office Communicator 2007 in Windows and Web applications. You can use the SDK to show presence on Web pages and embed communication entry points to Office Communicator 2007 in line-of-business applications. This version is the first release on CNET Download.com.