osx server domain

Hi all, i have recently shifted from windows server 2008 to mac mini osx server 3.0.

I have a setup of 8 pc runing windows 7 and connected to server 2008 with domain and it works fine.

i just got new mac mini and though to replace window server 2008. i configured my osx server and static ip address and domain name.

but when i change the domain name in windows 7 pc it shows me that no domain name found, i changed the dns ip address in my window 7 pc to my macmini ip address that worked fine but the pc do not except the domain name of osx server but it excepts the windows server domain name.

is there any way where my windows pc excepts the osx server domain name, i have created the user in osx server and set the premission and shared the folders but i want that window pc should login with that user just as it does with window server 2008. please guys help me out with this.