The Identity Management for Unix is a role service which means it is basically and extra feature of the ADS role.
If you have Windows Server 2008, to install the Identity Management you should follow these steps:
Start -> Administrative Tools-Server Manager
Start -> Administrator Tools -> Services for Network File System
Choose Roles
Scroll down to the Active Directory Domain Services
Click the Add Role Services link
On the the next screen Select Role Services Check the Indentity Management Checkbox
This will lead you through a wizard which will require a reboot of the server.
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