Yes, I'm quoting below page 11 of the planning guide:
The computer on which Microsoft Dynamics CRM 2011 is running must be a domain member in a domain that is running in one of the following Active Directory directory service domain modes:
- Windows 2000 Mixed
- Windows 2000 Native
- Windows Server 2003 Interim
- Windows Server 2003 Native
- Windows Server 2008 Interim
- Windows Server 2008 Native
Important
- The computer on which Microsoft Dynamics CRM is running cannot function as an Active Directory domain controller, unless it is running Windows Small Business Server 2008.
- When you install Microsoft Dynamics CRM in a Windows 2000 Mixed-mode domain, you cannot add users to Microsoft Dynamics CRM that are located in a different domain.
- Installing Microsoft Dynamics CRM Server 2011 in a domain that is running in Active Directory Application Mode (ADAM) is not supported.
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