Office 2003 Service Pack 1 (SP1) provides the latest updates to Microsoft Office 2003. SP1 contains significant security enhancements, in addition to stability and performance improvements. This download applies to the following Office 2003 products: Access 2003, Access 2003 Runtime, Excel 2003, FrontPage 2003, Outlook 2003, PowerPoint 2003, Publisher 2003, Word 2003, Office 2003 Web Components and Office XP Web Components. SP1 also includes many performance and feature enhancements for InfoPath 2003.

Update: Client and Administrative downloads are available now:
Download: Microsoft Office System 2003 Service Pack 1 (via OfficeUpdate)
Download: Office 2003 SP1 (Client Update) | Office 2003 SP1 (Admin Update)
Download: OneNote 2003 SP1 (Client Update) | OneNote 2003 SP1 (Admin Update)
Download: Project 2003 SP1 (Admin Update)
Download: Project Server 2003 (Admin Update)
Download: Visio 2003 SP1 (Admin Update)
View: Microsoft Press Release