Samba mount failed: "CIFS VFS: No username specified"

[^rooker]

[PROBLEM]
I tried to mount a windows share over Samba (using /etc/fstab), but got the following error message:

mount: wrong fs type, bad option, bad superblock on \\windowsbox\shared,
missing codepage or helper program, or other error
(for several filesystems (e.g. nfs, cifs) you might
need a /sbin/mount.<type> helper program)
In some cases useful info is found in syslog - try
dmesg | tail or so

Checking dmesg returned the following:

CIFS VFS: No username specified

All credentials were supplied and verified to be correct.
Puzzling...

[SOLUTION]
The "smbfs" package was missing.

Thanks to a blog entry by Nestor Urquiza.