New
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According to the latest Shawn posted, the new Edge will be releaased Jan 15 2020. Details said it will replace the existing Edge, they will not co-exisit.
Introducing the new Microsoft Edge and Bing
The release candidate of the new Microsoft Edge for Windows and macOS can be downloaded right now with general availability targeting Jan. 15 in more than 90 languages.
Microsoft Edge to Launch Without Key Features
Microsoft will not support running legacy Edge side-by-side with the new Edge either; when you install the new Edge, it will replace the old version.