The most critical aspect of Edge 109 is its role as the for several legacy operating systems. Following this release, Microsoft transitioned to requiring Windows 10 or later for all subsequent Edge updates.
: Despite officially ending support, Microsoft released a critical out-of-band security patch for Edge 109 in September 2023 to address a high-severity "heap buffer overflow" vulnerability (CVE-2023-4863). Key Features and Updates microsoft edge version 109
: While the browser continues to function on these systems, it stopped receiving new features or bug fixes after January 2023. The most critical aspect of Edge 109 is