The issue of the inability to open AD RMS protected documents with Microsoft Office 2003 has been resolved with a hotfix. You can obtain the hotfix at the following locations:

Office Client – KB978551

Word Viewer – KB978558

Excel Viewer – KB978557

Update (2/10/2010) - We recommend that AD RMS users download and install the update for AD RMS clients. If you have this update, the hotfix for Microsoft Office 2003 is not necessary.