How to edit message in the Lync that was already sent?

I am using Lync in the office everyday and I have looked for this functionality previously (no luck).

A quick search shows no information on the subject. Lync's FAQ also does not mention such feature - and its likely that this can not be done. If this functionality would exist, Microsoft would brag about it all over the place.

One thing that is relevant to the subject can be found here. FAQ clearly states that messages cannot be recalled after sending. Recalling messages and editing messages after sending are very similar functions and I believe if you cannot recall - you cannot edit.