Microsoft Office 2007 Service Pack 3 is the official pack from Microsoft that will allow you to bring Office 2007 up to date.
SP3 for Office 2007 offers essential bug fixes and improvements that will ensure your copy of Microsoft Office is safer and more stable than ever. It's easy to install and, even better, completely free.
What's in it?
If you use Office 2007, then Microsoft Office 2007 Service Pack 3 is essential. According to Microsoft, it offers general product fixes. Although this isn't very helpful, it basically offers you all of the improvements in stability, performance, and security that Microsoft have released as of September 2011. This includes Service Pack 2 and Service Pack 1 , if you haven't already downloaded them.
Downloading and installing Microsoft Office 2007 Service Pack 3 means you'll get the absolute max out of Office 2007.