> new Kerberos authentication,
Kerberos is anything but *new*,.. maybe new to you?
I doubt there's much Amiga support for kerberos. Kerberos and SMB shares (AD does it out of the box, Samba can be configured to do it with configuration) can be linked together so that you don't have to authenticate with a password again if you have the right keys from the KDC. But, it should allow you to authenticate with a password.
> Vista problems that some of us folk
Kerberos is an integral part of Active Directory so vista should have no problems working with Kerberos.
// Edit
You probably mean networking an Amiga and a box running Vista.. that's nothing to do with Kerberos. It's more likely to do that the encryption used to do the authentication in SMB has changed (again) for vista and smbfs doesn't support it.
Also, why would you need to go winding up the IT people when the details you need can easily be obtained by querying the network yourself?