[Kstarek]

Im not sure how they calculated this, I work in Finance for a Equity Research team that covers MSFT and while we estimate Cloud Revs for each, MSFT doesn't actually break out Azure revs. It's part of MSFT Intelligent Cloud which also includes: "several products other than Azure, including SQL Server, Windows Server, Visual Studio, System Center, consulting services and support."

[samspenc]

While Google and Microsoft don't break down their cloud revenue publicly (Amazon does with AWS), there are several finance research firms that have dug into the breakdown and they seem to more or less align.

Here's an example: https://www.statista.com/chart/18819/worldwide-market-share-... . The link is from Statista and aligns closely with the WSJ numbers, and it points to "Synergy Research Group" as a source for that breakdown.