IIS vs. Apache ?
Now, from time to time you will see similar questions in newsgroups or discussion forums. One would asked 'IIS better or Apache?', 'Can you tell you whether I should pick IIS or Apache?' ...... well again - no one will be able to answer you unless you provide more detail including the detail requirements, operation environment, integration planning and etc. If it's just pure web server, both are decent and you can pickup either one you like. Of coz, there are cost factor, supports, maintenance and etc considerations. Hence, only after all these facts are known, then you will begin to evaluate each product and see which one best fit your needs.
Next, just read this from Michael Howard's blog, where he is doing a study on the lastest IIS 6 vs Apache 2.x security. Part one was posted few days ago, so there were two bugs filed against IIS6 since launched :) I did talk about this too... but I won't categorized it as a 'real BUG' if you had locked down the server properly. Anyway, there were some comments on why compare with 2.x because according to study 1.x cover majority of Apache share in Web server market. Hence, today - Micheal posted analysis compare IIS6 and Apache 1.x, detail in part two. Still not convince ? hmm.. wait till IIS 7.0 then :)