AD RMS Client Requirements
http://technet.microsoft.com/en-us/library/dd772753(WS.10).aspx
The Active Directory Rights Management Services (AD RMS) client is included with the Windows Vista®, Windows® 7, Windows Server® 2008, and Windows Server® 2008 R2 operating systems. If you are using Windows XP, Windows 2000, or Windows Server 2003 as your client operating system, a compatible version of the AD RMS client is available for download from the Microsoft Download Center Web site.
http://technet.microsoft.com/en-us/library/dd772753(WS.10).aspx
The Active Directory Rights Management Services (AD RMS) client is included with the Windows Vista®, Windows® 7, Windows Server® 2008, and Windows Server® 2008 R2 operating systems. If you are using Windows XP, Windows 2000, or Windows Server 2003 as your client operating system, a compatible version of the AD RMS client is available for download from the Microsoft Download Center Web site.
