[CentOS] Centos 5.3 update do RHEL 5.3

Albert wrote:
...
> Thx for the answered, but the centos have commercial support like RHEL?

CentOS itself is a volunteer non-commercial effort.  If you want a 
paid-support OS RHEL is highly recommended, and CentOS would not exist 
without them.

There are also companies that offer commercial support for CentOS - 
google "centos commercial support" and you will find some.  One that I 
happen to know actively participates in CentOS is

http://www.owlriver.com/support/centos/

Phil