How to Set Up a Mac on a Windows Domain

Open the 'Directory Utility' tool. Switch to 'Finder' and navigate into the 'Applications' folder, followed by the 'Utilities folder', and run the 'Directory Utility.' Snow Leopard users (10.6) can either navigate to the 'System' folder, then the 'Library' folder, followed by the 'CoreServices' folder or find the 'Directory Utility' in the 'Accounts' preferences section of the 'System Preferences' available from the 'Apple' menu.
Enable Active Directory. If the lock icon is closed, authenticate with an administrative account to continue. Click the 'Services' button at the top of the window. If the 'Services' button is not visible, click the 'Show Advanced Settings' button at the bottom-right of the window. In the list of services, make sure the 'Active Directory' checkbox is checked.
Configure the domain connection. Enter the domain name in the 'Active Directory Domain' field. To configure advanced options, click 'Show Advanced Options.' Modifying these settings is optional and can include creating mobile accounts, configuring the user home directory, GID mapping and authentication preferences.
Configure mobile account settings (optional). A mobile account will allow the user to log into his account even when the computer is not connected to the network. This setting is primarily intended for users with laptop computers. To enable mobile accounts, click the 'Show Advanced Options' button and enable the 'Create mobile account at login' option in the 'User Experience' section.
Bind the Mac to the Active Directory Domain. Click the 'Bind' button. In the window that appears, enter a username and password that has permission to bind computers to the domain. Enter the organizational unit of the computer in the 'Computer OU' field. The other two checkboxes are optional and used to add the Active Directory to the authentication and contacts search policies respectively.
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