you may not be able to open a protected office 2003 document protected using RMS`

Starting on 11December 2009, some customers using Office 2003 are not be able to open Office 2003 documents protected with Information Rights Management (IRM) or save Office 2003 documents protected with IRM. This is caused by an IRM certificate expiring. This includes Word 2003, Word 2003 Viewer, Excel 2003, Excel 2003 Viewer, PowerPoint 2003 and Outlook 2003. It does not affect Office 2007 or Office 2010 Beta

Resolution:
A resolution has been quickly developed for this issue, and is available via the following KB items:
• http://support.microsoft.com/kb/978551 (Office 2003)
• http://support.microsoft.com/kb/978557 (Excel Viewer)
• http://support.microsoft.com/kb/978558 (Word Viewer)