In case of Microsoft's future Windows operating system called Windows 8 to be released late next year or in 2012. Symantec will have to release compatibility patches for Norton Internet Security 2011, Norton AntiVirus 2011, and Norton 360 v.4.0.
Then Norton Internet Security 2012, Norton AntiVirus 2012, and Norton 360 v.5.0 will directly support Microsoft Windows 8.
Also for future Norton security products to support Windows Vista, Windows 7, and support Windows XP as well.
Future Norton products compatibility suggestions.
Norton Internet Security 2014, Norton AntiVirus 2014, and Norton 360 v.6.0 will be the last version to support Windows XP. Also in around 2013 or 2014, Microsoft's Windows 9 might be release around that time.