Iria

Source: PC World
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On Thursday, Microsoft will officially launch Windows Vista--for business users, at least--and while I don't know what specific claims it'll make about the new product at its bash in New York, I'm pretty sure they'll boil down to the notion that Vista's a major upgrade and we all ought to get it.

Whether Vista is a big deal for you is a matter that only you can decide. (If you'd like some help, check out our review, upgrade guide, and FAQ.)

I'll write more about Vista--which I've been running, in various pre-release versions, for almost sixteen months--in a future post. But for now, a question which I might be the only person asking at the moment: What have been the most significant operating system upgrades of the whole PC era? The ones that were meaningful advances on their predecessors, highly-evolved expressions of major platforms, and/or particularly influential?