[Samba] samba problems after change of unix uids

[marvin24 at gmx.de]

Hi,

for some reason, I changed the uid of the users on my samba (3.0.7) pdc server 
(smbpasswd backend). I ran chown on the home directories so the linux clients 
can login fine. Windows users can still log in, but their profile vanished. 
I guess windows treats them as new users and overwrites the original profiles. 
Is there some way to "upgrade" the samba passwd file also?

Greetings

Marc