Most enterprises release like RedHat and Suse have configuration tools which are as easy as anything windows has, because you dont know how to use them does not reflect on the system it reflects on you. I dont know squat about iis6, that does not mean it sucks or is hard to config.
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I admit I'm exaggerating a bit. However, to be able to click that red ! you do need to purchase a subscription from RH.(this is for the ES AS WS versions)This automatically negates the "free" aspect. For the sake of disclosure we are an educational facility and get dirt cheap pricing from Microsoft .
Another pet peeve is the PHP problem with Apache 1.3 vs 2. I've had nothing but headaches with this one as there seems to be a backward compatibility problem (Linux geeks give me solutions).
I agree that in some cases Linux or any nix is a good idea. I would not run an FTP server on Windows (too much overhead). I like Apache (I really do)
However, when it come to file and print sharing, user management, application sharing, remote tools, typeyourpoisonSQL server. Windows runs best IMHO.