The Windows Live Messenger Library is a client-side library for building Web-based applications that integrate with Windows Live™ Messenger. With the Windows Live Messenger Library, developers can build presence-enabled instant messaging applications that Web site visitors can use to interact with each other and Windows Live Messenger client users.

The Windows Live Messenger Library is written in C# and compiled into JavaScript using Script#. Messenger Library applications can be written either in C# (with Script#) or JavaScript.

The Messenger Library can be used by Web sites hosted in any domain and works by using cross-site API calls to the Windows Live Messenger service.

 Documentation Map

What's New in the Windows Live Messenger Library

Summarizes new features and changes introduced in the current version

Developing with the Windows Live Messenger Library

Covers the fundamentals of developing applications that use the Windows Live Messenger Library, including step-by-step instructions for common tasks and programming conventions unique to the Windows Live Messenger Library.

The use of the Windows Live Messenger Library is governed by the Terms of Use.