Windows 11 users installing the latest cumulative update (KB5055523) might be scratching their heads after spotting a new and unexpected folder named C:\inetpub on their systems. For most everyday users, this is unfamiliar behaviour, so what exactly is it, and should you be concerned?
What Is the inetpub Folder?
Traditionally, the inetpub the directory is associated with Internet Information Services (IIS), Microsoft’s built-in web server for hosting websites and applications. This optional feature is created only when IIS is manually enabled.
But after the April 2025 Patch Tuesday updates, users started reporting that this folder appeared out of nowhere, even on systems where users (including me) have not enabled or installed it. You can see that clearly in the above screen.
Why Is It Appearing Now?
According to a growing number of threads on Reddit and Microsoft Answers, the folder shows up after installing Windows 11 KB5055523 or Windows 10 KB5055518. While initially thought to be a bug, Microsoft later confirmed that this behavior is intentional and part of recent changes implemented for system security and feature readiness.
“This is expected behavior,” Microsoft stated. “The
inetpubfolder is created as part of efforts to harden the operating system and should not be deleted.”
You can view Microsoft’s official release notes here: KB5055523 Update Documentation
What Users Are Saying
The update has sparked a flurry of discussion on forums and Reddit. One user on Microsoft Answers noticed the inetpub folder had disappeared after upgrading to 24H2, with no trace even in Windows.old. Another user dealing with the Windows 11 22H2 update said the folder was removed, but found it safely tucked away in Windows.old, allowing for manual recovery.
Users are puzzled but mostly unbothered, since the folder is empty and doesn’t seem to affect system performance. However, many are frustrated by the lack of clear communication from Microsoft prior to rollout.
Should You Delete It?
No. Even though the folder appears empty, Microsoft explicitly recommends not deleting it. While some users report no issues after removal, it may be tied to future system enhancements or internal features.
Unless you’re a developer actively using IIS, you can safely ignore the folder. If you’re curious, you can disable IIS under “Turn Windows features on or off”, but the folder may remain.
Final Thoughts
The surprise appearance of inetpub is a reminder that even minor updates can bring unexpected changes. While this one is harmless, it has stirred questions around transparency and the need for better update documentation.
For now, let the folder be, and rest assured—it’s not malware, it’s Microsoft.
