In case you receive an error such as
mount error(22): Invalid argument consider using the
sec=ntlmssp,nounix,noserverino mount options.
The reason is that Samba has been replaced with SMBX in this release with the security tightened. You may also find that the
ntlmssp scheme is only available in fairly recent, and not enterprise, versions of Linux.
Update: Red Hat 6.2's Release Notes state that, "Support for NTLMSSP authentication has been added to CIFS. In addition, CIFS now uses the kernel's crypto API."