SME Server:Documentation:FAQ:Section07

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Later versions of applications=

Why does SME Server still not have PHP 5, MySql4, Apach2, xxx

SME Server 7.x is based on Centos 4.x which in term is based on RedHat Enterprise Linux 4.x. Since the development team is limited in person and time, all work is done in spare time, we do not have the time to implement such big changes and cope with the maintenance of such work.

Is xxx on SME Server still safe to run?

Yes, because security fixes and bug fixes are backported to the 4.x releases and they are propagated to the users as updates, for more information have a look at http://www.redhat.com/security/updates/backporting.

Can I install a later version of xxx

Yes, but you are then responsible for updates and possible conflicts with updates

For example see this page for PHP#PHP_5 PHP updates and warnings