ok I Upped my system with PHP 5.2.9. But now I have issues with Fileinfo. Yes may it should be asked at Centos etc I know,
but maybe users here can help me faster.

php -v
PHP Warning:  PHP Startup: fileinfo: Unable to initialize module
Module compiled with module API=20050922, debug=0, thread-safety=0
PHP    compiled with module API=20060613, debug=0, thread-safety=0
These options need to match
 in Unknown on line 0
PHP 5.2.9 (cli) (built: Mar 10 2009 16:42:52)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies

For now I removed the Fileinfo package.
What is done with this package by RoundCube?

And most important...how can I fix this issue?

Thanks!