I dug into the details earlier this year, and it turned out at the time that Microsoft counts some undisclosed but significant percentage of revenue from sales of Office 365 in their "Commercial Cloud" category, even if you buy it in a box at a store... because in theory that box entitles you to Office In the Cloud. This (Azure plus some percentage of Office) is the "Azure" revenue number that gets compared to AWS and GCP to determine the market share number that you see in all the graphs.

Can anyone confirm/deny? I'm reasonably certain this is right from my reading of financial reports, but I'm no accountant.