The Microsoft Office product teams are proud to announce the release of Office 2003 Service Pack 3. While we know that many of you are enjoying the great functionality of Office 2007, we also know that there are many more of you who still continue to rely on Office 2003.
Office 2003 SP3 is focused on improved security across the entire suite of applications, fulfillment of top customer requests, and improved compatibility with Windows Vista. We recommend that all of Office 2003 users install the service pack.
In addition to continued media coverage, Microsoft will be conducting a webcast on 9/26 with more information.
Read more at source: http://blogs.msdn.com/outlook/archive/2007/09/21/office-2003-sp3-is-here.aspx