Windows has got a lot more stable since it's had Windows NT at it's core, but you need to maintain it well. With *nix, you don't have that problem. Can't say that Vista is all that stable though...
The thing is that Macs are just regular PCs with a nice design and a custom OS. Some people love that OS, some hate it, it's the same as other OSes.

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Thanks,
Ash
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