If you guessed that Sunrise's calendar app wasn't long for this world after Microsoft bought the company... well, you guessed correctly. Sunrise has revealed that it's phasing out its fan-favorite software. The app itself will vanish from digital stores over the next few days, and it'll stop working entirely on August 31st. Like it or not, you can't keep it around for the sake of familiarity -- you'll either have to switch to Outlook (which has some of Sunrise's DNA) or find an alternative.