Add to dictionary item grayed out in all Office 2007 apps

I’ve been running Office 2007 for a couple of weeks now and note that, when I misspell a word, get the red squiggle underling, right click on the word, the option to “add to dictionary” is grayed out, unavailable. Do any of you have a solution to this? I’ve searched the endless loops of Microsoft support pages and still not found the solution.

Thanks!