Restrict Logon to Computers in an Organizational Unit

I am running a winodws 2003 forest with only one domain. In this domain I have created three Organizational Units for the purpose of grouping my computers in the domain namely OU1, OU2, OU3. Each of these Organizational Units consists of about 500 Computers. I also have created three more Organizational Units for the purpose of grouping my users namely UserGroup1, UserGroup2, UserGroup3. Currently what any user can logon to any computer. I now want to device a policies which would only allow 1) UserGroup1 to only Logon to OU1     2) UserGroup2 to only Logon to OU2    3) UserGroup3 to only logon to OU3. That is to say I do not want users in UserGroup1 to be able to logon to computers that are in OU3. How do I implement such a policy.  
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aissimConnect With a Mentor Commented:
Give this a try:
First you'll have to create 3 security groups - one for each of your user OU's (we'll say SecUser1, SecUser2, SecUser3). Then you'll create three different GPO's, one assigned to each of your computer OU's.
Edit each of the GPO's and navigate to Computer Configuration | Windows Settings | Security Settings | Local Policies | User Rights Assignment | 'Allow log on locally'....define this setting and only allow SecUser1 group for the OU1 GPO.....SecUser2 group for the OU2 GPO...etc.

Good luck!
I can't think of any way in which this can be done with group policy.
Vadim RappCommented:
in addition to what asissim said: this policy setting won't allow you to only allow secuser1 etc.; it will require that Administrators should also be granted this permission. So you add local administrators; then you will have to ensure that local administrators group on all machines does not include domain users.
Good point! Forgot that part...
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