Or a Mac, or a Chromebook, or an iPad. It's hard to talk about this as a monolith since there are pretty distinct groups — most of the people I know who get to choose their device are using Mac or Linux (which is admittedly an atypical crowd of developers, scientists, lawyers, architects, etc.) but there are a ton of people who have professional jobs where that's not the case (e.g. everyone I know who works in healthcare uses some kind of Windows device which is so locked down that it might as well be an iPad, and I know some people at government agencies who are favoring ChromeOS for security reasons since you can lock those devices down so hard).
I make that distinction because it doesn't help Microsoft very much strategically if the cashier at McDonald's is sitting in front of a Windows box because they're interacting with a single application and will use whatever their next employer has standardized on when, say, they go somewhere which uses Square. Someone who uses Office is a bit more but as an increasing percentage of people aren't doing anything which they couldn't do in a browser, that's not as strong as it used to be. None of that means that Microsoft is going away but I think it does leave them really wondering how to avoid falling behind the next trend like they did with mobile devices.
Microsoft’s platform has never been weaker. For all the growth in phones, every professional worker on the planet is sitting in front of a PC.