Windows Phone
Tiles so clean you could eat off them. Apps so few you might have to.

Quick Bits
What It Was
Windows Phone was Microsoft's smartphone platform built around the Metro design language and a live-tile home screen that looked wildly cleaner than most of its competition. It showed up looking like a design student's dream project that somehow shipped.
Why It Mattered
It is still one of the clearest examples of mobile design that felt distinctive, coherent, and genuinely ahead of a lot of competitors visually. Windows Phone proved smartphone software did not have to copy everybody else to look polished.
Why It Could Not Survive
Without enough developer support and app coverage, even gorgeous design eventually runs out of road.
Windows Phone is remembered with unusual affection because it did not fail in a boring way. It failed looking fantastic.