The actual Microsoft corporate subculture is bizarre to behold, when contrasted with the perceived subculture of the Microsoft user, operator, systems administrator, penetration tester, et c.
There's no single Microsoft subculture. The company is too big, made of too many parts, and 4-dimensional. The culture of Windows in the 90's would be absolutely alien to the culture of (for example) Skype in the 201*'s.