"SP2 provides the usual security, performance and reliability fixes that SPs deliver. SP2 is especially tuned to update Outlook and SharePoint Server, according to the company. SP2 also includes support for more file formats, such as PDF and ODF, Microsoft oficials said. Here’s more from Microsoft’s release on Office 2007 SP2:"
As we always tell you, do your Microsoft updates. This Service pack is out and ready to download and install.