PC users can't help but notice the similarities between Apple's 'liquid glass' design philosophy and the Aero interface in Microsoft's Windows Vista OS from 2007.

It's hard to look at Apple's new "Liquid Glass" aesthetic and not think about Windows Vista, Microsoft 's much-maligned OS which also touted transparencies and glass-like effects as a bold new vision for computing.

Microsoft has officially poked fun at Apple's Liquid Glass UI overhaul by sharing images of an old Windows operating system version.