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The "Aero" look of Windows can be categorized into an esthetics era called "Frutiger Aero". (https://aesthetics.fandom.com/wiki/Frutiger_Aero)

The “Aero” in “Frutiger Aero” is Windows Aero. And Microsoft’s Segoe is practically Frutiger.

So more than being part of the era, I think it’s fair to say Windows Aero defined the aesthetic.