Shape files in OSM

Hi

Does OSM support displaying building shape files? For example dense ones like
http://www.arcgis.com/home/webmap/viewer.html?webmap=a72b0766aea04b48bf7a0e8c27ccc007

Also, Arcgis says:
“ArcGIS Online map services are available at no cost regardless of use.”

Does it mean their shapefiles can be downloaded from somewhere, and be used without license concerns by OSM?

Thanks

Bo

1.) To deal with shapefiles in OSM, have a look at http://wiki.openstreetmap.org/wiki/Shapefile

2.) When map data is available at no cost that does not mean you can use them for OSM due to its licence. Please read the whole Terms of Use at ArcGIS website there. Google Maps are also at no cost and we are NOT allowed to use …