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The last time Microsoft commented formally, they claimed 85 million active monthly Office 365 users in October 2016. On their April 27 analyst call to discuss Q3 FY17 results, CEO Satya Nadella said that the new number is “more than 100 million monthly active users.”

In other words, Office 365 has gained over 15 million new users over the last two quarters, or 2.5 million new users each month. If Microsoft maintains this rate, Office 365 will have close to 120 million active users by the end of calendar 2017.