I would highly recommend latest stable version 1.3 of Apache for Windows and latest version of eAccelerator. Apache 1.3 because of stability and eAccelerator because of performance impact. And the most important is security factor on Windows, you should take care about all updates and proper configuration of Apache, etc.
However for maximum performance and stability we recommend Linux environment (Apache, PHP, MySQL and latest version of APC).
See also: http://ez.no/community/forum/install_configuration/linux_or_windows_for_ez_publish/re_linux_or_windows_for_ez_publish