Office 365 has experienced great success since its launch in June 2011, but it's also had its share of failures as well. This article considers the most important technical advances in Office 365 and the most important parts of the ecosystem as well as some places where things didn't go quite so well as either Microsoft or tenants would have liked.
https://www.petri.com/office-365-successes-and-failures-since-2011
