Earlier quoted context omitted.
Everybody needs Office. There really is no practical way around it for businesses Now companies get a "free" (initially) software in addition to what they actually want. Microsoft can only afford that because they already get Money from their Monopoly product and can finance it that way without the customers having the ability to object (because Office has a market domineering position). Business chat competitors can…
I'd argue that Office has competition in the form of GSuite, which has collaborative features So how much market share does Office have to lose to GSuite before Microsoft can implement features that their competitor has? Put another way, does a dominant market player have to stagnate in order to avoid breaking antitrust law, rather than anticipating the needs of their customers to make their product more useful?
As far as I know they can innovate on the actual product as much as they want.
Teams itself may be the best software product ever. The issue lies in Microsoft using it's ownership of Office and Windows to "force"/"sell" it to customers.
The details of what that means exactly will be decided by a court.