Microsoft's Redmond campus is pleasant, collegial, and consists of nondescript corporate buildings of varying design connected by wooded pathways and large lawns. Actually a really nice place to work.
The campus has grown so much, however, that it has sprawled over several wide/ugly/pedestrian-unfriendly suburban roads in the process; there is substantially less greenery today than even a few years ago.
I worked in one of the main campus buildings that's been there for a while (Bldg 25) over the summer and walked to work every day. That is, hands down, one of the most pleasant walks I've had the joy of taking. I absolutely love the Microsoft main campus and think their design blends in perfectly. I'm not sure how to describe it but it just has this Seattle feel that makes the buildings seem very harmonious with the lush greenery of Seattle. If I had the chance, I'd probably pick that area over almost any other in the country to walk.
In case you can't tell, I've been back in Chicago for a year now and the weather is absolutely killing me.
I like the style of Epic Systems in Verona, WI. They have separate buildings connected by underground tunnels with geothermal heating/cooling for all of the buildings. Recently they started putting in solar and are working to increase that to the point of covering their energy needs. Parking is almost all underground with the ground around their campus designated as farmland so that nobody can build on it; they do run a farm on the land as well which I believe helps supply their cafeteria.
Every conference room has a theme and they allow self-guided tours. My favorite conference room is one where half of the room opens up to a pond that has a wooden walk way around it and a waterfall.
I felt differently when I visited. If anything, they at least show a progression over the general phases of the campus. Buildings 1-9 are very similar, as are the triangle buildings 16-18. A lot of the newer buildings (ie the 'Studios') are almost exactly the same. There are a few other buildings on campus (late 20's or 3*?) that show a similar architecture to the studios. But then, there is 'Red West' which is its own little mini campus in terms of design.
The reason I asked was because I wanted to see Microsoft categorized in such an easy and quick manner as Google/Apple. I must admit that I myself can't do that.
Edit: Disclosure, I have been to Microsoft's campus, but I just couldn't help but ask this question. :)