Microsoft has reportedly acquired Sunrise, the maker of a popular calendar app, for around $100 million, and will keep the app as a stand-alone product while also making use of the start-up’s technology for its own products, Techcrunch said.

Microsoft declined to comment.

Sunrise offers a suite of calendar products for Apple and Android, and its popularity is down to its ability to consolidate calendars from different providers. It lets users access content from providers such as Google, iCloud, and Microsoft Exchange, as well as connecting to a range of other third-party apps.

Microsoft has been ramping-up its cross-platform capabilities, both through its own and acquired technology.

Last week, Microsoft launched its Office apps for Android tablets alongside new Outlook apps for iOS and (in preview form) Android.

In December, it acquired Acompli, which makes a range of mobile email apps for iOS and Android, for $200 million – providing technology used in the latest Outlook apps.

Around the same time it also bought HockeyApp, a mobile crash analytics and app distribution service, in a move to bolster its tools and services to support mobile-centric development.