Windows 10's new Edge with Chromium browser preview builds drop today
windowscentral.com
windowscentral.com
The reading list is not implemented in this build, but I hope they add it back...
That said, the core point still remains that hopefully even if Edge doesn't continue to support EPUBs they might spin it out into an app.
Rebuilding Edge's Reading View is on the Focus Areas list for Edge-Chromium, so depending on how the EPUB system was built maybe that's just included in the Reading View rebuild. Certainly, if people provide it as feedback that it is something that people want, I expect they will consider what they can do. It even sounds like it may be the sort of thing that this Microsoft could also make an open source Chromium extension and let Chrome users have access to it as well.
Bear in mind, even when they shut down music, they didn't buy back everyone's music, because people could play their MP3s still with the desktop player or even alternative music players, whereas Microsoft's EPUBs use at the least their own licensing system, since they changed the file format to MSEPUB and have a separate license file for each. The only player is Edge, and Edge as it has been is going away.
While we don't know the extent of Microsoft's eBook sales to begin with, a full refund since the launch of service is generally the sort of thing you don't do unless there's no other option. If they had intention to continue eBook support, they'd surely have chosen to fast track EPUB support in Edgium instead.
DRM is literally all about licensing costs. Even if they were licensing the DRM tech from themselves, that was a licensing cost on the books, and it is entirely possible that that overhead was enough to close the licensing servers. That's before you get into whatever details of whatever contracts they were using to license the books from the various publishers.
Continuing to support DRM-free EPUB in someway or another is entirely orthogonal to continuing to run DRM license servers. It's very clear they no longer intend to run the license servers. It remains to be seen if they have interest in DRM-free EPUB viewing.
Also, Edge isn't going away soon and Edge doesn't seem to be related to the store shutdown, it seems to be license/cost-related. The previews for Chromium-based Edge are out now, but the switchover isn't expected for months or years from now. I'd be hugely surprised if the switchover deadline is any closer than Windows 20H1. There's no need to fast track EPUB support in Chromium-based Edge because Chromium-based Edge doesn't itself appear to be on a fast track for Windows.
I'm actually currently using Edge as my daily driver right now, but I will switch to Firefox once it will be replaced by "Windows 10-style Chromium". For web diversity.
The user agent is currently: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.48 Safari/537.36 Edg/74.1.96.24" - yes "Edg". That is not a typo.