Each year Okta processes millions of SaaS logons via its authentication system. It kindly aggregates that data to find the most popular apps and publishes an annual report. This year it found that the most popular tool by far was Microsoft Office 365. It’s worth noting that while app usage popularity varied by region, Office 365 was number one with a bullet across the board, whether globally or when the report broke it down by geographic area.
Link: Okta SaaS report finds Office 365 wins the cloud — sort of – TechCrunch