[CentOS] Changing from samba 3.0.33 to Samba 3,6,6

Mon Feb 24 17:03:00 UTC 2014
Timothy Kesten <centos-lst at gmx.de>

Hi Folks,  I'd like to change from Samba 3.0.33 to 3.6.6.
Reason: WINDOWS 7 and PDC

Is something to consider when changing (config-Files or so on)?
Have I to uninstall Samba 3.0.33 before or just run an update?

Thx for hints.