Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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https://redmondmag.com/articles/2017/03/24/office-365-outlook-log-in-problems.aspx
http://www.zdnet.com/article/microsoft-office-365-users-report-problems-with-exchange-online/
http://www.crn.com/news/applications-os/300077459/microsoft-experiences-global-office-365-outage.htm?itc=refresh
Also, what would you recommend fora backup solution for O365 Exchange?