Since months a underground work has been done to port the internals of linphone to windows.
Today a first pre-release of linphone running on windows with video support has been uploaded into the download page:
http://download.savannah.nongnu.org/releases/linphone/unstable/win32/
Enjoy !
This windows port has a new graphical interface called linphone-wx based on wxwidgets toolkit. It is under construction and not all features are yet available.
Unfortunataly 1.0.0 had a little bug (!).
1.0.x is a major release and provides many new features !