From their copyrights, it looks like

- Azure uses TomTom

- Bing uses HERE (formerly Navteq/Nokia)

Did Microsoft buy all of Nokia? Or just their phone business?

Microsoft only bought parts. HERE has been its own thing for a while now.

https://techcrunch.com/2016/12/15/here-and-microsoft-extend-...

Related - Uber hired/bought many of the engineers and assets involved in Bing Maps' data: https://techcrunch.com/2015/06/29/uber-acquires-part-of-bing...

Justin's theory is that the design focuses on a clean (empty?) look for mobile users. And on POIs, not streets.

https://www.justinobeirne.com/what-happened-to-google-maps