Acompli

Acompli is a free, powerful and easy-to-use email app that helps you get more done from anywhere. Attach files easily, swipe to delete or defer emails, and schedule meetings effortlessly with a fully integrated calendar. Acompli can even surface your most important email so you can stay focused on what matters. Available on iOS and Android, Acompli works for Gmail, iCloud, Yahoo, Outlook, MSN, Live, Exchange, Office 365 and Google for Work. Acompli is now Outlook Mobile. https://techcrunch.com/2014/12/01/microsoft-buys-email-app-acompli-for-200m-will-still-support-gmail-and-other-competitors/