A Microsoft keyboard would probably use cheap switches like Kailh, but like Corsair's early mechanical keyboards they would probably not be used on the entire keyboard. The plate would not be exposed, but composed of sunken parts of the plastic case.
Function keys and several keys with media functions, launching Internet Explorer and various Windows 8-features such as the Charms Bar etc., would probably be short-throw rubber dome keys on the sides. Some of the keys would be painted silver.
Curved or not, ergo or not, the keycaps would be their own cheap thin low-profile style. The case would have a built-in wrist rest and really wide really soft blobby edges, as if a cup of black tar had been poured onto the desk.