ArcGIS Explorer Online Retirement
As of December 10, 2013, ArcGIS Explorer Online has been moved to retired status. This means you will no longer be able to open maps in ArcGIS Explorer directly from items within ArcGIS Online. Items that are associated with ArcGIS Explorer will open in the ArcGIS Online map viewer instead. Until March 2014, you will still be able to open maps in ArcGIS Explorer Online by going directly to arcgis.com/explorer.