Service Pack 3 provides the latest updates to the 2007 Microsoft Office Suite. This update also applies to Microsoft Office Project, Microsoft Office SharePoint Designer, Microsoft Office Visio, and Visual Web Developer.
Previously unreleased fixes are included that were made specifically for this Service Pack.
In addition to general product fixes, this includes improvements in stability, performance, and security. All the public updates, security updates, cumulative updates, and hotfixes that were released through September 2011.
SP3 does not require SP1 or 2 as they are rolled into SP3.