"The 2007 Microsoft Office suite Service Pack 1 delivers important customer-requested stability and performance improvements, while incorporating further enhancements to user security. This service pack also includes all of the updates released for the 2007 Office suite prior to December of 2007. You can get a more complete description of SP1, including a list of issues that were fixed, in the Microsoft Knowledge Base article 936982: Description of the 2007 Microsoft Office suite Service Pack 1.

Service Pack 1 will install even if a publicly available update has already been installed on your computer.

This update applies to the following programs:
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 FrontPage 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"