Microsoft have been very helpful to OpenStreetMap. Since 2010 they allow the OSM community to trace from the Bing aerial imagery to add things to OSM. Roads, b

Microsoft have been very helpful to OpenStreetMap. Since 2010 they allow the OSM community to trace from the Bing aerial imagery to add things to OSM. Roads, buildings, everything you can see with the aerial imagery. It's fantastically useful. OpenStreetMap database would be a fraction of the size if it wasn't for Microsoft granting us this. As of July 2018, they allow us to use Streetside imagery too. (Alas you can't use the actual maps, just the aerial/satelite imagery) Yahoo allowed tracing from 2007 till 2011.