I did the following to upgrade my old samba installation
(after downloading):

[root@triton /tmp]# rpm --test -Uhv samba-*
[root@triton /tmp]# /etc/rc.d/init.d/smb stop
Shutting down SMB services:
[  OK  ]
Shutting down NMB services:
[  OK  ]
[root@triton /tmp]# rpm  -Uhv samba-*
warning: /etc/smb.conf created as /etc/smb.conf.rpmnew
samba
##################################################
samba-client
##################################################

I then discovered that my old smb.conf had gone:

[root@triton /tmp]# diff /etc/smb.conf /etc/smb.conf.rpmnew
[root@triton /tmp]# ll /etc/smb*
-rw-r--r--   1 root     root        10731 Jul 22 17:40
/etc/smb.conf
-rw-r--r--   1 root     root        10731 Jul 22 17:40
/etc/smb.conf.rpmnew
-rw-r--r--   1 root     root           97 Jul 22 17:40
/etc/smbusers

Oliver