Microsoft is said to have acquired Sunrise Atelier Inc., the maker of the Sunrise calendar application for around $100 million.

Sunrise offers a suite of calendar products for both mobile and desktop users that connects with and syncs to calendars from Google, iCloud, and Microsoft Exchange, offering an all-in-one hub solution on top of its core calendar offering. The app is available for iOS, Android, and the Mac App Store, as well as a web client.

The startup, based in New York City and founded in December 2012, had raised $8.2 million prior to acquisition over three rounds that included SV Angel, Box Group, 500 Startups, NextView Ventures, Slow Ventures and others.

Although the acquisition has not been officially announced, sources told Bloomberg that Sunrise’s mobile apps will continue to be supported for now. While it’s not clear whether Sunrise functionality will be built into existing Microsoft apps such as Outlook, the same source noted that “many users want a separate app for that task.”

For Microsoft, it’s their second acquisition of a productivity app in as many months. The Redmond tech oligarch purchased San Francisco-based email application builder Acompli Inc. in December for $200 million.

Both purchases come at a time where Microsoft has had a renewed focus on pushing its Office apps into the mobile and tablet markets across iOS and Android devices, a space it hasn’t paid much attention to as it was busy trying (unsuccessfully) to get people to use products like the Surface Tablet and phones running Microsoft Windows for Phone. Microsoft launched a new version of Outlook of iOS February 2nd that was highly praised.