![](https://tctechcrunch2011.files.wordpress.com/2014/05/sunrise.png?w=738)
Sunrise began as a newsletter that provided calendar info via email, but then quickly switched gears as a mobile-first alternative to the built-in calendar apps offered by Apple, with a focus on optimizing the experience for small-screened devices. It incorporated weather and offered RSVPs without leaving the app, along with clever UX tweaks like a two-week synopsis that expands when touched to reveal the whole month, making the most of the available real estate depending on how a user’s interaction is signalling their particular needs at any given moment.
Microsoft appears to recognize the value in trusting mobile companies to provide the best mobile experiences in areas where they once led: Redmond acquired Accompli late last year, a celebrated mobile email client, and quickly turned it into Outlook for iOS and Android, a version of its mail client that is mobile-first, taking the name of the desktop dinosaur that made Microsoft a household standard in productivity apps but discarding pretty much everything else from that legacy software in favor of a streamlined, smartphone-optimized experience.