No, it’s not OK to delete that new inetpub folder

Microsoft released a patch for CVE-2025-21204, a "link following" vulnerability in the Windows Update Stack that can allow an authenticated attacker to perform file operations as NT AUTHORITY\SYSTEM. Applying the update creates a %systemdrive%\inetpub folder as a mitigation and Microsoft warns users not to delete it; the update aims to prevent attackers from replacing files with links or shortcuts that resolve to unintended resources.