Nadella: Windows 11 Needs Serious Quality Work on Fundamentals

Microsoft’s fiscal Q4 2026 earnings landed on July 29 with revenue hitting $90 billion for the quarter, an 18% jump, and Microsoft Cloud surpassing $214 billion for the full year. For the average user, those figures are background noise. But tucked inside Satya Nadella’s prepared remarks was a single line about Windows 11 that hints at where the OS is headed.

Windows barely got a mention on the call, which has become standard practice. The Personal Computing segment, which houses the OS, saw a 4% quarterly decline, and Windows OEM revenue dropped 7%. Yet just before shifting to search and LinkedIn, Nadella offered this: “In Windows, we are investing to ensure that it has the best quality and fundamentals.”

That phrasing carries weight. Windows 11 stumbled through a rough 2025, and Microsoft knows it. In March, the company publicly committed to repairing the OS’s fundamentals after a stretch of broken updates. Since then, much of that promise has surfaced in Insider builds and stable releases. But Nadella, a leader who thinks in metrics and systems, choosing to highlight quality and fundamentals on investor day signals that the push to improve Windows 11 is far from finished.

What “best quality and fundamentals” actually means for Windows 11

This isn’t a fresh talking point. During the Q3 2026 earnings call in April, Nadella admitted Microsoft needed to “win back” Windows fans, calling out performance work for low RAM PCs, a smoother Windows Update experience, and a return to “core features and fundamentals that matter most to our customers.” Four months later, the language has tightened to two words, but the pressure has intensified, especially since the company also warned that Windows OEM revenue will decline in the high teens for the coming fiscal year.

Some of that fundamentals work is already visible. Microsoft has been rebuilding legacy Windows 11 UI components in WinUI, with the File Explorer Properties dialog receiving a recent refresh, and there are confirmed plans to move more of the OS onto the framework. Still, WinUI itself grapples with RAM and performance issues that Microsoft must resolve before larger elements, like the Start menu, can migrate over. Nadella’s emphasis on fundamentals suggests that work is accelerating, not winding down.

Nadella has spent a decade quietly shifting Windows out of the spotlight

It’s easy to forget that Windows once dominated every earnings narrative. Now it gets a passing sentence, even though it’s the OS that made Microsoft a household name and a workplace staple. That’s been Nadella’s approach since he took over as CEO in February 2014. His first strategic pitch was “mobile-first, cloud-first,” a phrase that conspicuously left Windows out. In his book Hit Refresh, he wrote about recognizing that the world had moved past the OS and about reshaping Microsoft’s engineering teams around cloud and AI instead. Windows 10 shipped as a free upgrade in 2015, less a product launch than a mechanism to unify the install base and steer it toward subscriptions and cloud services.

Commercial cloud revenue was under $3 billion when Nadella took the reins. Azure grew 43% this quarter and crossed $100 billion annually, while the segment containing Windows shrank. Windows still runs on over a billion devices, but it’s Azure, Microsoft 365, and Copilot that now carry the income statement. The OS is no longer the engine, just the entry point.

Can Microsoft actually fix Windows 11?

Skepticism is justified. Many users have stopped taking Microsoft’s promises at face value. But this year has delivered a steady stream of quality and fundamentals updates for Windows 11, and there are still five months left in the calendar to add more. Two points stand out.

First, Microsoft has already shown it can fix Windows 11 this year, just as it proved in 2025 that it could run the OS into the ground. Second, while Pavan Davuluri and the team dedicated to Windows improvements have convinced regular users that fixes are on the way, the CEO is now telling investors that more investment is coming. Given the track record and the money behind it, there’s more reason for optimism than there was a year ago.

Here’s a sampling of the fundamentals Windows 11 has already gained in 2026:

That list only scratches the surface. Windows Latest compiled all 18 confirmed fixes coming to Windows 11 in 2026 back in April, spanning WSL performance to Windows Hello reliability, and it’s worth a full read.

When will regular users actually see these changes?

Most of the improvements above remain limited to Windows Insiders or have only recently reached stable PCs through optional updates. Microsoft’s usual rhythm is to test fundamental changes in the Experimental channel for a few weeks before rolling them into a monthly Patch Tuesday or optional update. But with Nadella signaling more investment, expect a steady flow of enhancements through the rest of this year and into the next.

Investors don’t get assurances about UI polish without a reason. Microsoft believes that fixing Windows 11 now pays off later, especially with the OS positioned as the front door for the “secure edge AI” Nadella mentioned in the same breath.