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Huh, I haven't even looked at MS in years. I just styled them this way for consistency in markup and display.

How is BEM the Hungarian notation of CSS?

For those, like me, who hadn't heard of Hungarian notation: https://en.wikipedia.org/wiki/Hungarian_notation

(Not suggesting you're one of them.)

What is "microsoftish"?

I suppose the forms are vaguely reminiscent of Microsoft's rectangular, solid-colored forms

Which is funny because that look has only been used by MS for the past 2-3 years. But yes, it's their current look. :)

That was my reading of it too. They do resemble the flat aesthetic of Microsoft's Metro.