Starting on December 11, 2009, customers using Office 2003 will not be able to open Office 2003 documents protected with the Active Directory Rights Management Service (AD RMS) or Rights Management Services (RMS). To download the hotfix, see KB 978551
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Read the complete post at http://blogs.technet.com/technet_flash_feed/archive/2009/12/17/download-the-hotfix-for-the-office-2003-irm-issue.aspx