Can I work offline with ArcGIS Explorer?
ArcGIS Explorer is meant to be used in a connected environment, since the default map, basemaps, and functions are provided via ArcGIS Online, but ArcGIS Explorer will work with reduced capabilities in a disconnected (or intermittently connected) environment. You can work directly with local content or any Web-based content you’ve visited (and therefore cached locally), but you won’t be able to use Find or other capabilities that rely on an ArcGIS Online connection.
