As a webmaster, I hear of that linux server(eg. apache) are much reliable and stable than mirosoft window server(eg. IIS) . I know it is a fact , not rumor. But as I know microsoft dot com is listed in top 10 most visited sites. (actually top 3) I never see the site is down . How can MS make it ? It seems IIS is also suitable for large scale site and heavy traffic site . How do you think of it ?