We have been using the arcgis.com and sharing the maps in the regular arcgis.com way, but recently found that the arcexplorer has more options when dealing with legends and such. When I use the share button to get a link to the arcexplorer based map its just takes me to arcgis.com/explorer where there are other maps that don't have anything to do with our stuff. Do you have to be logged in to use arcexplorer?