It is not a fragment -- it's a complete sentence. The subject is "resource" (modified by "that"), the verb is "is", and the subject complement (or predicate adjective) is "unsupported" (modified by "currently"). "To my knowledge" is an adverbial phrase modifying the verb. I'm not sure how to describe "Bob" as part of the sentence structure, for it's been a looong time since eighth grade.
I suspect MS Word got confused by "that", which often indicates the start of a dependent clause. (As "which" did in the preceding sentence.)
Anyway, it is a complete sentence, but it's not a pretty sentence. I'm not sure how to recast it more gracefully, though. I might add a comma after "knowledge" -- but I tend to over-comma, so you should get a second opinion.