Chances are that Bing and Windows Phone will never be pulled. They are there because Microsoft has to be in certain markets, regardless of actual performance, in order to sell its technology stack as fully-featured and comprehensive. In the same way, Xbox will never be pulled.
Microsoft can drop the occasional service, but they rarely run from big platform bets. Most above-mentioned products were small fish or even just websites -- with the exception of Silverlight (but that's because in-browser media plugins as a category have been basically obsoleted across the whole market) and Zune (again, mp3 players have been basically obsoleted), they don't really sit on the same shelf as Office, Windows, Xbox, Windows Phone, Bing, VisualStudio or SQLServer.
Microsoft can drop the occasional service, but they rarely run from big platform bets. Most above-mentioned products were small fish or even just websites -- with the exception of Silverlight (but that's because in-browser media plugins as a category have been basically obsoleted across the whole market) and Zune (again, mp3 players have been basically obsoleted), they don't really sit on the same shelf as Office, Windows, Xbox, Windows Phone, Bing, VisualStudio or SQLServer.