Microsoft’s Windows Insider Program just turned 12. To mark it, the company released a set of official anniversary wallpapers — and then quietly confirmed they were made on a Mac. Not a Surface Studio. Not an RTX Spark laptop. A MacBook, running the Mac version of Adobe Photoshop. Rafael Rivera, a longtime Windows observer, spotted the metadata: file properties listed macOS as the OS and Photoshop for Mac as the authoring tool. Microsoft’s own email to Insiders claimed the images were “inspired by 12 years of the Windows Insider Program and the latest Surface design aesthetic.” The mismatch landed like a typo in a keynote slide. It’s not that Photoshop isn’t available on Windows, it is, including on Windows 11 Arm devices. And Adobe’s app runs well on the new RTX Spark laptops, per Windows Central. But Microsoft’s in-house design team used the Mac version anyway. Rivera clarified the work was done internally, not outsourced. So this wasn’t a contractor’s preference slipping through procurement. It was Microsoft’s choice. The timing stings. Microsoft is pushing hard on Windows 11 as a reason to upgrade hardware, touting new AI features, performance gains, and Surface-aligned design language. Meanwhile, its own designers reached for Apple’s hardware to build the visual identity of its flagship insider program. No one’s claiming this breaks Windows. But yes, it fuels the old joke, now with receipts. That even Microsoft’s creatives reach for Macs when it’s time to ship pixels. The wallpapers are free. They’re also ironic. Microsoft hasn’t commented publicly beyond the original email. The files remain live. Next up: Windows 11’s next major update, expected early next year, and whether its splash screen gets made on Windows, too.