Service Pack 1, released on June 28, 2011, was a cumulative update that stabilized the suite and introduced key features. List of all Office 2010 SP1 packages - Microsoft Support
: The update is architecture-specific. You must match the SP1 version (x86 or x64) to the version of Office 2010 currently installed on your PC. Prerequisites : To apply SP1, you must have the base version of Office 2010 already installed. Troubleshooting microsoftofficeprofessionalplus2010sp1hunx86x64 new