MS has never lacked in making good tools/APIs. The devs themselves (the ones that really matter to the initial success of a platform, not indies) need to be paid off at first when competitors have >100x the installed userbase.
Almost all of your examples were piss-ant markets at the time, and MS didn't really care if they failed. For the others:
- Zune didn't matter, because phones were getting MP3 playback at that time
- Courier and Kin were just experiments, don't know what SuperPhone is
- If the second gen Surface doesn't sell, then you can call it a failure. It's an idea that always needed Haswell (RT was always a backup plan for MS, and they didn't even bother distributing it widely)
- Metro is a failure? MS is estimated to be the OS for 7.4% of tablet sales after just one quarter
For markets that actually matter, you're judging MS way too soon. You're also forgetting the biggest success MS has had in developing a new platform in the face of a dominant entrenched competitor and courting developers to it: XBox. Not being mobile is irrelevant.
Most dev studios had little reason to port their games to the XBox at first, because PS and PS2 comprised 95%+ of the market. MS had to pump in $4B to get people to buy their hardware and get devs on the platform, and had to execute almost flawlessly. It's very hard to break into a new market that depends on third party software for success.
There's no way Nokia could have pulled that off with Meego. It has orders of magnitude less experience with ISV relations than MS, and there's no hook like MS has with the Win 8 kernel (or PC dev -> XBox).
MS is not going to give on WP8 like it did with past experimental platforms. Well, not until 2016 at least, when MS has another opening through phones that can run fully fledged Windows 8.
Interesting reasoning. The failures don't count because.. they didn't really care? What, they were just going through the motions and weren't actually interested in a piece of the iPhone, iPod, Palm, Blackberry, Nokia or Symbian action at the time?
Ok. So they must not really care about MSN (sorry, Live, no make that Bing), Hotmail (err.. Outlook), Skydrive, Internet Explorer, IIS, SQL Server and HyperV. Perfectly happy to let the competition eat their lunch. When and if they ever get serious about any of these their dominance will surely be inevitable.
Just like the XBox, which IS significant because it was actually successful. They must've just cared enough about that one. Of course, they've yet to break even on that business, and it remains to be seen whether their next generation has what it takes to do one better and beat 3rd place.
WP is sitting at less than 5%. Hmm, that's a tough one. Let's be charitable and say their previous mobile platforms just didn't count. So it's been about 2 years. What do you reckon? Care or not?