Who's using Windows 10? Microsoft hasn't offered much in the way of detailed data. But a survey out this week from Spiceworks provides insight on Windows 10 adoption rates, as well as the industries in which the OS is proving most popular.

Early this year, Microsoft reported that there were 200 million systems running Windows 10. The company says it wants to increase that number to one billion within the next three years.

Will Microsoft reach the billion-device goal for Windows 10? Spiceworks says it's well on track, at least in the business world. So far, Windows 10's penetration rate among businesses is 18 percent, the company says.

That's consistent with statements from last summer, which Spiceworks also collected, indicating that businesses hope to reach a 40 percent Windows 10 adoption rate by the end of July 2016.

Businesses also appear to be more eager to upgrade to Windows 10 than they were to Windows 8 when the latter was released. Windows 8's market penetration rate after six months -- the same amount of time that has passed since Windows 10 launched -- was 9.3 percent, just over half of the current Windows 10 rate.

Of course, Windows 10 is not Windows 8. Nor is Microsoft's "marketing" strategy the same. The company has been about as aggressive as it possibly can be in promoting Windows 10 by making it (nominally) free and delivering it as an automatic update to some machines. Microsoft has also made compatibility with earlier versions of Windows verboten among some hardware vendors on most future devices.

These strategies have less of a direct impact on the business world than they do on individual consumers, of course. But they still send a loud message from Microsoft that Windows 10 -- whether businesses, or anyone else, like it or not -- is the future (unless, of course, you want to do something crazy like stop using Windows altogether). And the message has been received, it seems.