After installing Office 2007, the following plugin shows up in Firefox:
2007 Microsoft Office system 12.0.4518.1014
Office Plugin for Netscape Navigator
What exactly does it do?
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Google doesn't know. There is a pretty good article about the previous version on ProcessList.
But the current version? No details. This page is #5 on the results!
Microsoft doesn't know. Use the inline "Bing" interface at www.microsoft.com
At some point in the future, I would expect the Mozilla Plugin Checker will at least display the current version, but I think that is all you can determine for now, without calling Microsoft and getting the paid-for-support answer.