Yahoo is building a new calendar app with help from the creator of Sunrise

Mention the name of Sunrise to a select demographic of nerds and you're likely to elicit a visceral reaction. Before Microsoft purchased the calendar software in 2015 and shut it down about a year later, it was one of those apps people loved to praise. Thoughtful design and features helped it differentiate itself and earn a passionate fanbase in a crowded market that was dominated by heavyweights like GCal. But then Microsoft shut down the app and fans were left to look elsewhere, with almost no...