The watchdog said in a working paper in June that it was "at an early stage" of considering potential remedies.

Solutions floated at the time included imposing price controls restricting the level of egress fees, lowering technical barriers to switching cloud providers, and banning agreements encouraging firms to commit more spend in return for discounts.

One contentious measure the regulator said it was considering was requiring Microsoft to apply the same pricing for its software regardless of which cloud it's hosted on — a move that would have a significant impact on Microsoft's pricing structures.