https://blogs.office.com/2015/09/30/likes-and-mentions-coming-to-outlook-on-the-web
https://blogs.office.com/2015/08/04/new-features-coming-to-outlook-on-the-web/
http://blogs.office.com/2015/05/18/outlook-web-app-onedrive-for-business-just-got-better/
Office365 Groups: http://blogs.office.com/2014/09/25/delivering-first-chapter-groups-office-365/