Users interested in Arcgis 9.3 generally download:
ArcGIS for AutoCAD is a free, downloadable plug-in application for AutoCAD that provides interoperability between AutoCAD and ArcGIS. Within the AutoCAD environment, you gain easy access to enterprise GIS maps, map services, image services, and feature services hosted by ArcGIS...
Additional suggestions for Arcgis 9.3 by our robot:
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This patch addresses issues that may affect workflows and general performance.
ArcGIS 10.1 SP1 ...users of ArcGIS 10.1 SP1
It adds projections and geotransformations for use with ArcGIS Explorer Desktop.
use with ArcGIS Explorer ...Desktop. The ArcGIS Explorer setup ...using other ArcGIS products