Microsoft filed this lawsuit against Corel 10 days ago (December 18, 2015), claiming all profits to Corel Home Office.
Having said that yeah this is pretty disappointing behavior but I wouldn't be surprised if it's simply part of the company doing things others don't know about; maybe if enough attention is drawn to it it'll be dropped? Yeah that's probably unlikely but so many of their groups are full of awesome people and it sucks when a company does something stupid to tarnish its image.