Introduced the ability to attach PDF files to drawings as underlays and improved the overall quality of published PDFs.
. While now considered a "legacy" or "historical" version, it introduced several foundational features still used in modern CAD workflows Autodesk Community, Autodesk Forums, Autodesk Forum Key Features of the 2010 Release 64-Bit Performance Autodesk AutoCAD 2010 -64-BIT-