The long term support release TYPO3 CMS 4.5 is still supported with critical bug-fixes and security issues, while version 4.6 is now the first release no further bug-fixes will be applied to, even its codebase is younger. Systems that are currently using TYPO3 CMS 4.6 should be upgraded to the stable TYPO3 CMS 6.1.
TYPO3 CMS 4.6 became famous for important changes like the enabled caching framework, an optimized and faster Fluid rendering and the transition to XLIFF for localization handling, including the new <link http: translation.typo3.org _blank>translation server back then. Special thanks goes to our release manager of 4.6 <link http: about.me xperseguers _blank>Xavier Perseguers for managing and maintaining a TYPO3 version known for its stability and reliability.
By the same terms, TYPO3 CMS "old stable" 4.7 now reaches the end of full maintenance concerning regular bug-fixes. This means, only priority bug-fixes and security issues will be considered. However, we are proud to announce that this period of usually six months, now officially gets extended to 12 months in total. Special thanks go to TYPO3 Association Member <link http: www.mproject.eu _blank>m project Market Relations (Frankfurt/DE) for sponsoring the porting of security fixes and accordant release management in TYPO3 CMS 4.7 for the additional period from October 2013 to April 2014.
On behalf of the TYPO3 CMS Release Team