Cory Doctorow says "Microsoft announces it will shut down ebook program and confiscate its customers' libraries."
https://boingboing.net/2019/04/02/bu...libraries.html
Maybe a bit dramatic, but the headline is accurate. Basically, Microsoft isn't making enough money from the bookstore, so they are shutting it down. That's OK so far, but they are also shutting down the DRM authentication servers. They are at least offering refunds for books purchased, but when I buy a book it is because I value the book more highly than the money I spend for it.