That's a link to Apple's chart, not MSFT. And MSFT has been tracking the overall market pretty closely over the past few years. It hasn't been tanking, nor booming. I'd say that's a validation of wglb's point, no? Investors don't care about anything but revenue, and revenue of a company this size tracks the economy, and thus it behaves pretty much the same as the market does.
Look closer. It's a link to a chart that compares the share prices of Apple and Microsoft over the past five years. Apple, driven by innovation, has increased by 400%. Microsoft, with its consistent profits, has remained almost perfectly flat.
This makes the previous poster's claim that investors have responded positively to Microsoft's approach look pretty weak.