Microsoft pushed one security update and it broke at least 10 different services. The update it included 114 security fixes and 2 emergency patches. After the update user experienced computers that won’t boot, Outlook that crashes, Remote Desktop that fails, shutdown buttons that do nothing. And Microsoft is still investigating why some systems show a black screen and would not start again.

A Windows and Microsoft story that keeps getting worse.

This was one of the largest Microsoft patch releases in history. 114 vulnerabilities fixed, 8 rated Critical, 106 Important. The breakdown: 57 privilege escalation flaws, 22 remote code execution bugs, and 22 information disclosure vulnerabilities. Three zero-days in total, one actively exploited in the wild and two publicly known before Microsoft could patch them.

The update was mandatory because hackers were already exploiting a zero-day vulnerability, so users had no real choice. Patch now or stay vulnerable. Millions patched, and then the chaos ensued.

Here is a list of what some users experienced after installing the update:

• Computers stopped booting entirely
• Remote Desktop connections failed on login
• Shutdown and hibernate do nothing, instead the computer would reboot
• Outlook Classed crashes if you use POP accounts or PST files on OneDrive (most frequent reported problem to us)
• OneDrive and Dropbox freezes when opening or saving files
• NVIDIA users reported losing 15 to 20 FPS (frames per second) in games
• Random black screens and GPU driver crashes
• Desktop wallpaper reverts to black
• File Explorer ignores custom folder settings
• USB drives fail to format with FAT32

Ten problems from one update, and Microsoft needed two emergency patches just to fix some of them.

For comparison in 2025 Microsoft patched 1,130 vulnerabilities across the year; this was 12% more than 2024. Likely the number of patches will be even higher in 2026.