A QR Code is a matrix barcode (or two-dimensional code), readable by QR scanners, mobile phones with a camera, and smartphones. The code consists of black modules arranged in a square pattern on a white background.
QR Coder 2010 is an Outlook 2010 add-in that allows you to generate QR Codes for individual appointments, contacts and tasks. You can access it from Outlook Add-ins menu after open the item. This tool uses Google Chart API, as such, Internet access is required.