Microsoft has release Office 2003 SP1 (which includes InfoPath SP1) as well as OneNote SP1 (which is a separate download). Bug fixes, security improvements, and enhanced functionality abound. Be sure to read the release notes and linked web pages/articles before you download and install, especially if you have a pre-release version installed. Also note that you may be required to provide the original CD, depending on how you installed the software in the first place.

If your software is centrally managed and installed over a network, don't install these files yourself unless they specifically tell you to do so - Your IT department will need to update their network installation points and push the updates out (once they test and make sure all is well, of course).

Regular users of Office 2003 can also just browse to the Office Update site and use the “Check for Updates” link provided there. An ActiveX control will install and check to see what software is installed on your computer that requires updating, and then it will download and install the updates for you.

Note: The links below provided by Microsoft on their web pages to the related Knoledge Base articles and related web pages are not active as of the time of this writing, and they have not yet updated the Office Resource Kit Administration site. Those links shoudl become active shortly.

Office 2003 Service Pack 1 contains significant security enhancements, in addition to stability and performance improvements. Service Pack 1 (SP1) also includes many performance and feature enhancements to Microsoft Office InfoPath 2003. Some of the fixes included with SP1 have been previously released as separate updates. This service pack combines them into one update. You can get specific information about this update in the Microsoft Knowledge Base article (842532): Description of Office 2003 Service Pack 1.  UPDATE: Those who control Office 2003 with Windows Group Policy will want to get the updated Administrative Template (ADM) files.

OneNote 2003 Service Pack 1 contains new features and significant security enhancements, in addition to stability and performance improvements. You can get specific information about this update in the Microsoft Knowledge Base article (842774): Description of OneNote 2003 Service Pack 1. I also posted a list of changes and enhancements back when the OneNote team released a preview version of OneNote SP1, but note that the final version may contain additions/changes. You might also be interested in reading Chris Pratley's blog - he writes a lot about the OneNote team and the evolution of their product. His blog was one source of ideas that were funneled into the product team for potential future enhancements.