Links:
[1] http://pulse.veltsos.com/category/it/software/software/os/microsoft
[2] http://pulse.veltsos.com/category/it/open-source-foss
[3] http://pulse.veltsos.com/category/it/software
[4] http://linux.philosweb.com/drupal5/files/windows_open_source_1.jpg
[5] http://www.opensourcewindows.org/