sent upstream (that is, submitted to the core developers of the afflicted software). Examples Many features of Windows Vista were backported to Windows XP when Service Pack 3 was released for Windows XP, thereby facilitating compatibility of applications (mostly games) originally with Vista as a minimum requirement to run on XP SP3 as a minimum requirement instead. Debian Project since September 2010 provides an official backporting service for some Debian Linux software packages, and Ubuntu Linux also supports backports, however Ubuntu Backports receives no support at all from Canonical, and is entirely community-maintained. See also Backward compatibility Retrofitting Java backporting tools References Software maintenance Software quality Patch utilities