Microsoft had made it mandatory to update your LIVE Messenger to the latest V9.0 (or version 14.0.8089). Why one says 9.0 and the other says 14.0 beats me. Maybe they should really just merge them somehow to avoid confusion.
If you want to just download it straight away now, do so at:
In any case, people like me who hates advertisements, you can grab the latest APatch to remove them (partially) from: