How can I determine the service pack running for Office 2007?
Official answer from MS: is not that easy.
In any Office product, click on Help | About.
Um, just realised there's no Help menu in Office 2007, which may well be why you were asking. One product that does still have the normal menus is Outlook 2007, so you can do it there. The about screen on mine says:
Microsoft Office Outlook 2007 (12.0.6504.5000) SP2 MSO (12.0.6425.1000)
which is Service Pack 2.
In Word, Office button, Word Options, Resources (and then you can see the version number at the bottom)