The Microsoft Office 2007 Service Pack 3 (SP3) and Office Language Pack 2007 SP3 delivers important customer-requested stability and performance improvements, while incorporating further enhancements to user security. It provide the latest updates to the 2007 Office suite and to Office Language Pack 2007.

These updates include two main categories of fixes:
* Previously unreleased fixes that were made specifically for this service pack. In addition to general product fixes, this includes improvements in stability, in performance, and in security.
* All the public updates, security updates, cumulative updates, and hotfixes that were released through September 2011.
Because Office service packs are cumulative, you do not have to install Service Pack 1 or Service Pack 2 before you install Service Pack 3. Service Pack 3 includes all fixes which were included in SP1 and SP2.

Overview of the 2007 Office suite SP3 improvements:
* Documents that require custom security trimming are not returned from alert search queries, even if the user who created the alert could see and query for these documents.
* Non-Unicode characters in certain error message strings now display correctly.
* Four new bibliography styles are now available in the "Word Citations & Bibliography" feature: Harvard Anglia, IEEE, APA Sixth Edition, and MLA Seventh Edition.
* Chinese New Year holiday is now included in the Outlook calendar for Singapore.
* Fixes an issue in which Excel 2007 sometimes crashes when you open an Excel workbook previously saved in a newer version of Excel. This occurs if the file uses a new feature that is not available in the 2007 Office system.
* Fixes issues with the Pre and Post Reform rules in the French Thesaurus.
* Fixes an issue in which encryption settings are not configurable when they are used with a file format compatibility pack converter and Office 2003 or an earlier version of Office.
* Fixes an issue in which a crash sometimes occurs when an Excel workbook is opened in Excel and then previewed by using the Windows Explorer preview pane feature.
* Fixes an issue in which Excel Slicers and Ribbon customizations are lost when an XLSX file is first saved as an ODS file, and then saved as an XLSX file in Excel 2007.

Service Pack 3 will update the following:
* Microsoft Office Basic 2007
* Microsoft Office Enterprise 2007
* Microsoft Office Home and Student 2007
* Microsoft Office Professional 2007
* Microsoft Office Professional Plus 2007
* Microsoft Office Small Business 2007
* Microsoft Office Small Business Management 2007
* Microsoft Office Standard 2007
* Microsoft Office Ultimate 2007
* Microsoft Office Access 2007
* Microsoft Office Excel 2007
* Microsoft Office InfoPath 2007
* Microsoft Office Outlook 2007
* Microsoft Office PowerPoint 2007
* Microsoft Office Publisher 2007
* Microsoft Office Word 2007
* Microsoft Office OneNote 2007
* Microsoft Office Groove 2007