For specific bugs fixes, download the 'Microsoft Office 2010 Service Pack 1 Changes' workbook discussed later in this article. Specifically, these are the key areas of improvement in SP1.
All the public updates that were released through June 2011, and all the cumulative updates that were released through April 2011.In addition to general product fixes, these fixes include improvements in stability, performance, and in security. Previously unreleased fixes that were made specifically for this service pack.This service pack includes two main categories of fixes: Microsoft Office 2010 Service Pack 1 (SP1) provides the latest updates for Office 2010.