Ogbert
Member
As others have suggested, the clause looks quite straightforward; a block allows either party to walk away from the deal.
I think the thing that we have no idea about is their ability or desire to extend the timeframe of the agreement. There's nothing at law that would stop them doing so, as long as both are still willing (it would be a bit of a faff, but feasible).
I'm broadly of the opinion that MS are actually making more noise about this to try and push the deal through.