When you try to open an Information Rights Management (IRM)-protected Excel workbook, you may receive the following error message:
This build of Microsoft Office is unsigned and cannot be trusted by a production Windows Rights Management Services (RMS Server). Before using Information Rights Management (IRM) in this build, specify a test RMS server.
This problem is caused by specific shipped files that are codesigned by using a certificate that is configured incorrectly. In this case, the Excel.exe file is codesigned by using the problematic certificate.
To resolve this issue, apply the update that is described in the following article in the Microsoft Knowledge Base:
2598350 Description of the Excel 2010 hotfix package (Excel-x-none.msp): June 26, 2012
文章識別碼：2725909 - 最後檢閱時間：2012年7月6日 - 修訂： 1
Microsoft Excel 2010