Years ago Microsoft would have not made such a move. They would have kept trying until the bitter end (e.g. Zune, Microsoft phone). Instead Nadella and team made a decision based more on what works for the users rather that what works for Microsoft. It’s not a radical notion in itself, but for a company that prides itself on being successful and dominant, it’s a big switch. And it’s not just here with browsers. Microsoft’s cloud service, Azure, has a range of technology supported. It’s one of the reasons it is successful.
Microsoft has always been a successful company. They were successful under Gates and Ballmer with one approach. Nadella has a somewhat different approach, and I believe they will continue to be successful with it.