ArcGIS 10.1 was released in June 2012. This tag should be used for questions that involve use of ArcGIS 10.1. The online help is available at http://resources.arcgis.com/en/help/main/10.1/
ArcGIS is a large platform so try to always use a product tag such as
arcgis-desktop in conjunction with this version tag which applies to the platform as a whole.