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.