I had to finally open up a support case to get to the details of what’s included in KB2825640:
For Office 2010: when we install Office 2010 SP2 on a computer that has Windows Server 2003 SP2 installed, we receive the following error message: “The installation of this package failed”.
Error message when you try to install a large Windows Installer package or a large Windows Installer patch package in Windows Server 2003 or in Windows XP: “Error 1718. File was rejected by digital signature policy” .
In SharePoint: After we upgrade the SharePoint Web Front End (WFE) from Windows Server 2008 (R2) to Windows Server 2012, certain SharePoint Designer-customized views that have custom XSL templates may be broken. This issue, was resolved with KB2825640 afterupdating SharePoint Server update of June 2013 or a later version Cumulative Update (CU) and also upgrading the operating system.