Interesting tidbit from Investors Business Daily article on ZS:

"The cybersecurity firm is getting a boost from the growth of Microsoft Office 365, an online version of Microsoft’s (MSFT) productivity software. The cybersecurity tools check data traffic for malware.

Zscaler “has disclosed that 22% of the traffic that is secured through its 100-plus global data centers is attributable to Office 365, which is 10 times the levels from three years ago and represents 25% of the Office 365 base,” said UBS analyst Fatima Boolani in a June 19 report.

… “This suggests the company is processing web security requests from upwards of 45 million users — based on Microsoft’s most recent disclosure of Office 365 Commercial user count of 180 million.”