In the evolutionary chain of computer-aided design (CAD) software, certain versions stand out not just for their stability, but for introducing workflows that are still standard today. AutoCAD 2006 is one such relic. Released in the spring of 2005 (as part of the yearly release cycle that ended with the ".0" naming convention), AutoCAD 2006 bridged the gap between the era of command-line dominance and the fully visual, tooltip-driven interfaces of the modern era.
Because Autodesk no longer supports perpetual licenses from that era, you cannot legally download it from Autodesk. However, if you have a physical CD, DVD, or a stored license file: autocad 2006
Trim/Extend (TR / EX): Clean up intersections by cutting or lengthening lines. 3. Annotation & Dimensioning AutoCAD 2006: A Deep Dive into the 20-Year-Old
For daily professional production: No. The lack of modern PDF support, cloud collaboration, and 3D capabilities makes it a liability. You are better off with a modern subscription or even the free AutoCAD Web app. How to Recover or Transfer an Old AutoCAD