Microsoft corporate vice president Yusuf Mehdi mentioned during his appearance at the Ignite keynote that there are now over 70 million active users of the commercial versions of Office 365. But that number isn't new. What's going on with Office 365 adoption?

While I often praise Microsoft for its transparency, the firm has made it difficult to ascertain the success of many of its products using traditional methods. With Windows 10, for example, Microsoft has moved from marketshare-type numbers (licenses sold) to usage share (active devices). But it is quite opaque about other products and services. Skype, for example, has apparently never moved past its 350 million user milestone, and Microsoft measure Xbox success on engagement---time spent online, perhaps---rather than boxes sold.