The words "O/S Flame war" were mentioned and so I
had to be here...
1. There is no correlation between number of users and number of vulnerabilities.
Technically correct, but its not vulnerabilities that matter, its
known vulnerabilities, and I would say there is some correlation between those and number of users.
2. Microsoft, as a corporation, has little reason to seek out and patch coded vulnerabilites which are not already known.
Thats like saying any company 'has little reason to improve its product'. There is a huge reason, that is, consumer satisfaction, and making sure they dont go to another product. But, I see your point, mainly in that there is no realistic alternative to windows that alot of people could go to, and so there is no reason to improve their product.
3. Linux is highly modularized, and proper user permissions can limit the extent of the damage.
Its a trade-off between security, and letting people who arent that great with computers be able to still use them. Im not sure how many normal windows users (read: 90+% of the modern western population) could handle properly managing permissions. Maybe they could, but it would take lots of explaining, and alot of pain to do it.
4. Most linux users aren't stupid enough to click here to get bonzai buddy.
Thats because intelligent people are attracted to linux. If the 90% of windows users started using linux, they wouldnt magically grow some intelligence, and they'd still click that bonzai buddy. Linux is blessed with a (relatively) intelligent user base. That doesnt mean windows is crap software, it means that alot of the users are stupid.
You know, attempting to argue the superiority or just plain equality of a monopoly software on a forum dedicated to an open-source video game might be somewhat difficult.
Why does it matter where the discussion is being held? Facts are facts. Arguing on the internet with the intent to 'win' or convert people is retarded in the first place. All you can realistically hope to do is put out your point and express your opinions. And I'd much rather do that where people dont agree with my opinions, then preaching to the converted, per se.
I hear people using the "I don't trust software from the interenet it might be spyware itself" arguement alot, but come on. WIndows itself uses its little wga checker to send stats back to Microsoft. It dials home constantly. Who knows what it does precisely.
Who knows? Uh, I could, using etheral if I could be bothered. I dont base my computing software needs on vague conspiracy theories. It is however FACT that there are 'anti spyware' programs that are spyware in themselves, and if someones been foolish enough to get spyware on their computer in the first place, I think a little paranoia about downloading programs from then on might be a good thing

No - seriously its an all encompasing suite of crap. We're required to remove it from every computer we process at my place of work. There are better free alternatives.
Norton is quite possibly the worst, most useless, complete utter crap peice of software I have ever encountered. It should be burnt wherever encountered. It is spawn of evil.
Considering the fact that unix and linux servers dominate gov and college campus's and servers, it is actually the OS that is attempted to be brute force hacked more than any other.
Thats a bit of a different situation- you have clearly competent (I'd hope!) admins looking after the computers and the software. The 'noob' users arent responsible for setting up and maintaining the computers themselves. So you can easily put them in a sandbox and not let them touch anything important, like (Im guessing- Im not a windows system admin) you can do on windows. (I do know you can deny alot of permissions on windows, but as I said, I'm not an admin).
Of course once MS releases Vista and forces people to upgrade (down the road when they stop selling and support for XP) you will really be in trouble as from what I've heard you will have less control of your machine and they will have more intrusive powers over what you can do with it. I am simplifying, of course, but take a look on the web beyond the windows hype and you may be disturbed.
OMG WINDOWS ARE SPYWAREZ THEY WILL FORCE YOU TO UPGRADEZ THEN THEY SPY ON YOU!!!! KEKEKE LOZ!!!111oneone.
I think the best defence to this is, ironically, windows supposed 'insecurity'- In reply to the numerous conspiracy theories, Microsoft has said basically "Dont you think, that if we had some sort of backdoor in our program for a non-published reason (read: CIA or FBI access, etc), then someone would find out about it? It would be impossible to hide". You dont trust microsoft to keep a secure system, yet you think they could expertly hide something liek a system spyer or backdoor on there without anyone finding out about it? If it was hardcoded, and a hacker found it, think of the vulnerabilities... It might kind of seem possible to you, but if you're the head of a Multi billion dollar software development company with everything to lose (and tens of thousands of employees to silence, as well), I dont think you're going to be doing that. Nearly everything about how the windows O/S is uncovered by hackers, so how would they hide something this big?? (That, not to mention, could easily be found out via a simple snoop on your network traffic).
So, if we depart imagination conspiracy land and venture back into reality, you will see Mircrosoft windows is an O/S that, while not being perfect, caters to the needs of the general population of computing users, and does that better than anybody else. Thats why they're so successful.