Microsoft products are no longer ubiquitous. That's an early 2010s view. In 2026 most clients are running Android, followed by iOS, followed by Mac, and use Google Docs for their office work. Windows is only used on a per-company basis. If your company uses it it uses it, otherwise it doesn't.
Only small companies here (North EU - Sweden) use Mac + Gsuite + Slack + Zoom as a stack.
Companies over 20 staff are on Windows laptops + Office 365 E3 or E5.
Android and iOS? Sure on the phones...
What "clients" are you talking about? Edit: Re-reading I think you mean clients as in general computers, not business clients. Yes, more of the world is on phones but that is due to cost and society (ipad/iphone kids or third world on android). Real work is all done on PCs/Macs.
Schools are on chromebooks for the kids and Windows or Mac for teachers.
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You got it mostly right. It's Android, then iOS, then Windows. It is still the number one PC OS, in terms of active users and sales. MacOS is a distant second. Of course in 2026, if you want to make money as a developer selling directly to consumers, your best targets are probably iOS and macOS. Android and Windows are rife with users who'll never buy anything and pirates.
You're confusing number of people with percentages. There's still a large share of people who'll pay to use software on windows or android provided your software is good enough. This wrong impression comes from the fact that many users are from 3rd world countries who can't afford anything else. Steam made their entire business selling stuff on windows. And not just proprietary software. Many blender and godot addons are paid and nobody complains. Apart from developing software, where linux and osx are far ahead, in terms of industry software such a autodesk, solidworks, rhino, flstudio, etc, windows is THE platform you want to target of you are planning on monetization. And I'm saying this as a exclusive linux user of 3 years. You know who won't pay money? Linux users. Not out of lack of it, but mostly because of principle of FOSS software. And yes, I'd rather use a inferior FOSS alternative than a slightly better proprietary one