Sunrise, the calendar app that was bought by Microsoft last year, is officially sunsetting on August 31. You won't be able to download it any more, and the app will stop working altogether. In a blog post that went up today, the Sunrise team explained that they won't be able to support or update the Sunrise app any more since they will be busy working on the Outlook app for iOS and Android. That means no new features, no more bug fixes and the app is being removed from app stores in the next few days. Come August 31, the app will officially shut down and stop working altogether. So even if you download it before it disappears, it won't do you any good. Sunrise was our previous pick for best calendar app on iPhone, but when Microsoft bought Sunrise and announced that it would be merging the app with Outlook, we made the switch to Fantastical 2.