Starting on June 17th, 2020, Microsoft has begun to roll out the KB4567409 update for Windows 7 that installs the new Chromium-based Microsoft Edge browser.
Fix] Prevent or Remove Microsoft Edge Automatic Installation in
Microsoft is forcing Outlook and Teams to open links in Edge, and
Windows 10 21H2 is now widely available, Windows 11 remains optional
Windows 7 and 8.1 users: Now Microsoft is pushing out new Edge
Microsoft implements DMA compliance measures - EU Policy Blog
Microsoft Edge - Download
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The Windows Update policies you should set and why - Microsoft