Microsoft is taking further steps to kill off the antiquated Internet Explorer in favor of its new Microsoft Edge browser. Microsoft has been recommending users switch from Internet Explorer for years, yet it still has an almost 5% market share in browser use. The list of incompatible sites is managed by Microsoft and currently contains 1,156 sites, including Twitter, Facebook, Instagram, Google Drive, Microsoft Teams, ESPN, Yahoo Mail, and many others. Microsoft Edge will also prompt users to migrate their Internet Explorer settings, data, and cookies to Microsoft Edge.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-begins-to-finally-kill-off-internet-explorer/