не вижу компьютер с samba в списке компьютеров с Windows компьютера.

комп в домен нормально введён ? и да, он очевидно не контроллер домена, и отдельные локалки комп не стыкует - поэтому oslevel уменьшать, а preffered browser и master browser выключить. Ещё можно для верности browseable=yes в [global]

preffered browser и master browser менял на no и os level изначально стоял в 1.
browseable=yes стоит в smb.conf, но вот в testparm он не показывается и в логах нет его..

# cat smb.conf
[global]
workgroup = office
netbios name = FORMAIL
server string = ForMail Samba Server 3.0
security = ads
realm = OFFICE.SPRUT.RU
password server = 192.168.64.254
auth methods = winbind
encrypt passwords = yes
security = ADS
allow trusted domains = No
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
os level = 1
preferred master = no
local master = no
domain master = no
dns proxy = yes
ldap ssl = no
idmap uid = 10000-20000
idmap gid = 10000-20000
strict locking = No
time server = Yes
log file = /var/log/samba/samba.%m
max log size = 500 0
log level = 5
unix charset = UTF-8
dos charset = cp866
load printers = No
disable spoolss = Yes
show add printer wizard = No
case sensitive = no
default case = lower
preserve case = yes
printing = bsd
printcap name = /dev/null
interfaces = seth0
winbind use default domain = false
winbind refresh tickets = yes
winbind separator= /
winbind enum users = yes
winbind enum groups = yes
client use spnego = yes
restrict anonymous = 2
wins support = yes
follow symlinks = yes
wide links = yes
unix extensions = no

acl compatibility = auto
#client codepage=1251

browse list= yes
browseable=yes
...


# testparm -s
Load smb config files from /etc/samba/smb.conf
Loaded services file OK.
These may not be accessible to some older clients.
(Eg. Windows9x, WindowsMe, and smbclient prior to Samba 3.0.)
Server role: ROLE_DOMAIN_MEMBER
[global]
dos charset = cp866
workgroup = OFFICE
realm = OFFICE.SPRUT.RU
server string = ForMail Samba Server 3.0
interfaces = seth0
security = ADS
auth methods = winbind
allow trusted domains = No
password server = 192.168.64.254
restrict anonymous = 2
log level = 5
log file = /var/log/samba/samba.%m
max log size = 500
time server = Yes
unix extensions = No
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
load printers = No
printcap name = /dev/null
disable spoolss = Yes
show add printer wizard = No
os level = 1
local master = No
domain master = No
wins support = Yes
ldap ssl = no
idmap uid = 10000-20000
idmap gid = 10000-20000
winbind separator = /
winbind enum users = Yes
winbind enum groups = Yes
winbind refresh tickets = Yes
printing = bsd
print command = lpr -r -P'%p' %s
lpq command = lpq -P'%p'
lprm command = lprm -P'%p' %j
case sensitive = No
strict locking = No
wide links = Yes