Re: I'm still using Office 2007 SP2
Only areas of potential concern are you are also probably using Outlook, so anticipate no further spam filter updates and some integration tools eg. outlook-gmail contact sync. tools may not be maintained, so expect problems if gmail etc. change their interface.
But in saying that, I note that many third-party add-ons still support Office 97/2000/2K3...
Only other thing is to prepare a final WSUS Offline archive, includig Visio and Project.