From Microsoft Edge to stop ePub format reading support:
Updated Microsoft Edge Support page: Download an ePub app to keep reading in Microsoft Edge
I liked the ease of using Microsoft Edge to read ePub books and am disappointed with the change. In looking over the current options available in the Microsoft Store, I wasn't impressed. Bookviser eBook Reader and Sumatra, suggested in Best PDF and eBook Reader Apps for Windows 10 may be the best free current options available. I used Sumatra for a long time before Microsoft Edge added the capability to read PDFs.
Microsoft has shared that the Edge browser will no longer support e-books which use .epub file extension. Reading eBooks had been one of the strongest features of Edge, but this one particular extension is bring dropped. It is most widely supported vendor-independent XML-based e-book format; that is, it is supported by the almost all hardware readers. The support page has been updated recently, i.e., 20 August 2019.
Updated Microsoft Edge Support page: Download an ePub app to keep reading in Microsoft Edge
I liked the ease of using Microsoft Edge to read ePub books and am disappointed with the change. In looking over the current options available in the Microsoft Store, I wasn't impressed. Bookviser eBook Reader and Sumatra, suggested in Best PDF and eBook Reader Apps for Windows 10 may be the best free current options available. I used Sumatra for a long time before Microsoft Edge added the capability to read PDFs.