Windows Live
On November 25, 2008, Microsoft released Windows Live Agents 5.1 SDK for developers to build their Windows Live Agents for Windows Live Messenger. However, they also announced that this will be the last version of the Windows Live Agents SDK. Support for Windows Live Agents has been discontinued on June 30, 2009. The Windows Live Agents Partner Hosting Portal also stopped accepting any new Agents hosting requests as of this date. It is currently unknown however whether Windows Live Messenger will also cease support for Windows Live Agents in future versions.