This week, Microsoft has found itself navigating both a technical infrastructure transition and a mounting legal challenge. A key Secure Boot certificate has expired, threatening to limit security updates for older Windows devices, while a class action lawsuit accuses the company of exaggerating the capabilities of its Copilot AI assistant during a critical growth phase for Azure.
The expired certificate, known as KEK-CA-2011, is part of Microsoft’s Secure Boot mechanism, which verifies that software loaded during system startup is trustworthy. Without the newer certificate issued in 2023, machines will still boot normally and receive regular Windows updates, but they will lose access to future protections for the boot manager, Secure Boot databases, and patches for newly discovered boot vulnerabilities. Two additional Microsoft certificates are set to expire this year: the UEFI-CA-2011 on June 27 and the Windows-Production-PCA-2011 on October 19. Microsoft is rolling out updated certificates automatically to most devices, and many OEMs are pushing firmware updates. The impact extends beyond consumer PCs—Google Cloud updated its Compute Engine documentation to flag the expirations for Shielded VMs created before November 7, 2025, that have not yet been patched.
On the same day Microsoft published preview updates for Windows 11—including KB5095091 for version 26H1, which adds a point-in-time restore feature and fixes a freeze affecting Outlook and other apps—it also acknowledged a separate compatibility snag. Since June 9, certain third-party applications have been unable to launch Office programs after installing Windows updates. A permanent fix is in the pipeline, and Microsoft is advising users to open files directly as a workaround.
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The legal front adds a different kind of pressure. A US law firm set a deadline of August 11, 2026, for investors to step forward as lead plaintiffs in a proposed class action. The suit alleges that Microsoft misled shareholders about the functionality of its Copilot AI assistant and the growth trajectory of Azure, its cloud platform. The January earnings report triggered a 10% single-day slump after Azure growth slowed to 39%, and the company’s AI infrastructure spending ballooned to $37.5 billion. Microsoft has denied the allegations and vowed to defend itself in court.
Despite the noise, the software giant delivered stronger operational results in the quarter ended March. Revenue rose to $82.9 billion, cloud revenue increased 29%, and Azure re-accelerated to 40% growth. Yet the stock has struggled to regain momentum. In U.S. trading, Microsoft shares recently changed hands at $373.94, up 1.8% on the session, but the European listing closed at €329.10 on Tuesday—a year-to-date decline of over 18%. The current price sits well below both the 52-week high of €478.10 from last October and the 200-day moving average.
The twin challenges—a smooth certificate transition and a credible legal defense—will test Microsoft’s enterprise credibility. A flawless rollout of the replacement certificates would reaffirm confidence in the company’s maintenance of the Windows ecosystem, while a quick resolution of the Office compatibility issue would limit operational friction. On the legal side, any lingering uncertainty over Copilot’s commercial promise could keep a lid on the recovery in the stock until the August filing deadline passes and the next earnings cycle provides clearer evidence that Azure’s growth story is intact.
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