Today's good question comes from Xavier. He asked about Microsoft Windows Vista support for AutoCAD 2006.
AutoCAD 2006 and earlier releases do not support the Vista operating system. AutoCAD 2008 does support both the Vista 32bit and 64bit OS. AutoCAD 2007 also supports Window's Vista if you install Service Pack 2. For more information view the AutoCAD 2008 Features and Specifications and the Readme for AutoCAD 2007 Service Pack 2.