If you want an eye-opening education, go read Mini-Microsoft (including the comments). Some groups are better than others but... The performance review system

If you want an eye-opening education, go read Mini-Microsoft (including the comments). Some groups are better than others but... The performance review system causes corporate politics and backstabbing that beggar the imagination. MS has Darwinian competitions of very similar products that result in massive waste (see Kin that should have rolled in to Windows Phone). They do not manage dependencies well, leading to excruciating effort just to check in code. And they are basically headless.