Walt, who is usually a huge Mac fan, says Windows 7 is a worthy competitor to Apple's OS X Snow Leopard:
In recent years, I, like many other reviewers, have argued that Apple’s Mac OS X operating system is much better than Windows. That’s no longer true. I still give the Mac OS a slight edge because it has a much easier and cheaper upgrade path; more built-in software programs; and far less vulnerability to viruses and other malicious software, which are overwhelmingly built to run on Windows.