The end of support means that there will be no more automatic updates or technical assistance provided by Microsoft. This also means that continuing to use Microsoft XP and Office 2003 will leave you more vulnerable to threats from hackers, virus’s and malware.
With regard to Autodesk software, Autodesk is notifying customers that the current AutoCAD 2014 software release is the final version that will be supported on Microsoft Windows XP. That means that for the life of the product Autodesk will support you. (Current version and three previous versions.)Despite this, Computer Aided Business Systems firmly recommend that you upgrade your Operating System or make plans to use current, supported Microsoft programs.