[Samba] Help with migration

[Alejandro Iacobelli]

Hello to all, my name is Alejandro and I have a little question to anyone of this list.

 I´ve created ,6 years ago, an ldap+smb proyect for a big company. Back then, samba (Lenny server)  only worked with NT hashes but now (Squeeze server) they want to authenticate with Win7 (ntlm2 protocols) And configurating windows7 to accept old NT hashes is not an exit. I want to update ONLY the smb package from samba (2:3.2.5-4lenny15) to samba (2:3.5.6~dfsg-3squeeze8). 
PD: I'm using an OLD and modified by myself openldap version so i cant touch it.

 My question is this:


 Have someone of you did this kind of migration any time? can you give me advices? 

 i need to know if something could go wrong in the relation with openldap.