The apps that Microsoft has been buying recently are just incredibly top notch. Sunrise, Accompli, and now Wunderlist?!? Crazy good best-in-class products.
I also think Tempo is head and shoulders above Sunrise after spending significant time with both. I can't find the value in a calendar app that lacks the ability to dial a conference call number in 2015.
Maybe time to pick up some stock hah they seem to be making succesful purchases that make sense vs "diworsification"