You version of Samba does not support Windows 7. You must use version
3.2.15 at least.
Ooops! The minimum version is in fact 3.2.12. Sorry.
To be precise, I quote from http://wiki.samba.org/index.php/Windows7
Support for Windows 7 and Windows 2008 using Samba Domain Controllers
has been added to the following versions:
* Samba 3.4 or later
* Samba 3.3.5 or later
* Samba 3.3.2, 3.3.3 and 3.3.4 (with NOTES)
* Samba 3.2.12 or later
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