My only guess is they have a parallel skunkworks working on the same thing, but in a way that they can keep it closed-source - that this was a hedge they think they no longer need, and they are missing the forest for the trees on the benefits of cross-pollination and open source ethos to their business.
Worked fine for MS with Excel supporting Lotus 123 and Word supporting WordPerfect's formats when those were dominant...
Meanwhile Excel was gaining features and winning users with them even before Windows was in play.