On March 10, Microsoft and Nook Media updated their agreement forged two years ago, according to a new 8-K filing by Barnes & Noble.
Under terms of the amendment, Nook Media is allowed to discontinue distributing the Nook Windows app and to cease work on its Windows Phone app. Ouch.
There seemingly is a replacement app coming for the Nook Windows app, however. It's rather confusingly named "Microsoft Consumer Reader."