You guys make it sound so simple..
There are certain things like the Multi asio thing that will not work under Windows.
I once did a project of porting a server from SUN Solaris to Red hat Linux, and its not only just a matter of compiling the stuff on a windows compiler. All the scripting and such needs to be redone.
Porting such a huge project from Linux to windows will take Lionstracs at least a year to get a stable OS.
Only programming the drivers for windows will take a single programmer months.