[Samba] Samba 3 and Exchange 2007

[Gaiseric Vandal]

Anyone running Exchange in the same environment as Samba 3?

I have a samba 3.x domain (samba domain controllers) "DomainA" for most 
of the users at my company.  I have a Windows 2003 domain "DomainB" , 
for about 6 users.    I have also have a Windows 2008 domain , which is 
used for Exchange 2007 ("ExchangeDomain") . There is no trust between 
the Exchange domain and the Samba domain. There is no trust between the 
Exchange domain and the Windows 2003 domain.

Each user in domainA or domainB has a separate account in DomainX for 
e-mail access.         Machines are Windows 7 SP1 Pro (most are x64, 
some are x32.)       The machines in the samba domain have the following 
registry change so they can join the domain


[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManWorkstation\Parameters]

"DomainCompatibilityMode"=dword:00000001
"DNSNameResolutionRequired"=dword:00000000


On machines with the registry change (even if removed from the domain) , 
Outlook 2007 does not remember passwords for the Exchange accounts.     
Machines with out the registry change don't have this problem.       
This is not a problem on XP machines.



Apart from allowing compatibility with Samba domains, what does the 
DomainCompatibilityMode registry change actually do?   Or why it would 
cause problems with Outlook?

Thanks