Like Sunrise, business users flocked to the San Francisco-based startup’s eponymous email app to help them manage their inboxes on the go. In December 2014, Microsoft acquired Acompli for an undisclosed amount. Incidentally, the current Outlook apps for iOS and Android hail from another acquisition. The timing on the app’s shutdown suggests that Microsoft is satisfied that it has successfully carried the Sunrise feature set and user experience into Outlook. “We will leave Sunrise in market until its features are fully integrated into Outlook, the exact timing of which we will communicate in advance.” Javier Soltero, corporate vice president of Microsoft Outlook, noted that as Sunrise’s features were ported to the Outlook mobile apps, “Outlook will eventually replace the current Sunrise app,” in an Oct. Last fall, the software giant signaled that the day would arrive.

It comes as no surprise that Microsoft is retiring the app. The app garnered a 4.5-star average rating on Apple’s App Store and a 4-star rating at Google Play. Sunrise is bidding farewell on a high note and it’s understandable that Microsoft will want to pull the app before its quality suffers. “On August 31st, we’ll officially shut down the app and it will stop working all together,” they added. Over the next few days, Microsoft will be yanking the Sunrise app from the Apple App Store and Google Play. For us, that’s the definition of a lousy app and it’s not a user experience we want to leave you with,” they wrote. The Sunrise team explained in a May 11 blog post that due to their involvement in developing the Outlook mobile apps, which inherited many of Sunrise’s capabilities, they are no longer able to support the app.

Microsoft acquired Sunrise Atelier, the app’s developer, last year in a deal reportedly worth $100 million.

The popular calendar app for iOS and Android is shutting down on Wednesday, August 31st. This summer, Sunrise users face a choice: switch to Outlook or look elsewhere for their mobile scheduling needs.

Sunrise replacement for evernote