All Microsoft had to do was implement a store in addition to the previously-open nature of Windows Mobile, clean up the GUI a bit (the GUI was always the weak point of PocketPC/Windows Mobile/Windows Phone) and they would have a serious contender. Instead, they took the most attractive features of Windows Mobile and threw it away, and turned it into yet another would-be iPhone contender: too much too little too late.
What you describe is exactly Windows Phone (formerly known as Windows Mobile) 6.5 and it has not done well in the market. Its main features were a massive cleanup (as opposed to complete redesign in the case of 7) of the UI to make it more "finger friendly", Windows Marketplace for Mobile (i.e., an app store) and My Phone for backup/restore/find my phone. The lackluster sales of 6.5 have really shown that Microsoft had little choice but to undertake the massive backwards incompatible rewrite that is WP7.
Who would decide whose marriages are "in the best interest of society" and what criteria would be used?
It would be hard to nail down fair, clear criteria unless it was something very simple like couples can only be married if they are currently raising minor children. Study after study (http://www.apa.org/pi/parent.html) has shown that kids raised by 2 gay parents fare about as well as those raised by 2 straight parents. The more significant component seems to be having two actively involved parents raising a child, rather than their specific gender or sexual orientation. Even then, there are plenty of single parents who do a much better job of raising their children than many couples, even married couples who are the biological parents of the child.
Most importantly though, it's undeniable that people (straight, gay, single, coupled) are going to continue having children regardless of their ability to marry. Don't those children deserve the protections conferred by the parents raising them being able to marry?
Even taking children out of the equation, there is a clear case to be made for supporting marriage. I mean, nobody's ever worked hard to ban or dissolve the marriages of people who either could not have or chose not to have children, right? Married people tend to fare better than those who are single with regard to happiness, longevity and health.
If you hype something and it succeeds, you're a genius -- it wasn't a hype. If you hype it and it fails, then it was just a hype. -- Neil Bogart