From the Microsoft blog post announcing the change in plan:
We have learned a tremendous amount from our experience and believe this decision, while a hard one, can serve as a catalyst for more sustainable strategies. To that end, we intend to provide publishers with digital copies of their scanned books. We are also removing our contractual restrictions placed on the digitized library content and making the scanning equipment available to our digitization partners and libraries to continue digitization programs. We hope that our investments will help increase the discoverability of all the valuable content that resides in the world of books and scholarly publications.