samba - Apr 2013 - migrate samba3 to samba4

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Hello list,
I have centos 5 server running samba-3.3.7-1 using tdbsam, no ldap.
I want to upgrade to samba 4 to implement active directory DC server.
What is the smoothest options do I have?
If I upgrade using RPM, I must upgrade to centos 6. If I upgrade from
source, some libraries from centos 6 is needed. So, I must install new
server, perhaps with new distro.
If I have new server with samba 4 installed, how to migrate samba user
and settings without rejoining to domain?
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Hi Everybody
I have an environment with Samba3 and ldap in the company and we are
studying the migration to Samba4, keeping the user base, groups and
workstations registered.
I would like to know the best way suited for this migration. One of
unsuccessful attempts we had was to establish a trust relationship between
the domain Samba3 and Samba4 to use ADMT from Microsoft and import users
and groups, but it was not possible to establish the relationship between
the domains/




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Nat?lia Vaz