To proceed, the deal must be approved by the CMA and the regulators in the EU and the USA.
The European Commission has delayed making its final decision until 22 May 2023 but has indicated that it may look favourably on the deal following Microsoft's licensing deals with Nvidia and Nintendo.
On the other hand, the Federal Trade Commission originally raised competition concerns in 2022 over the reduction of competition and creation of monopolies for gaming subscription services, cloud gaming and high-performance consoles, mirroring the earlier, more wide-ranging concerns of the CMA.
Its investigation is still at an early stage, and a hearing is scheduled for 2 August 2023 to review evidence of the anti-trust risk in the US market.
Microsoft and Activision have already announced their intention to appeal the decision by the CMA; however, this is often a lengthy process of several months, and the CMA has won the majority of appeal cases brought against it.
To bring an appeal, Microsoft must file a notice with the Competition Appeal Tribunal and convince a panel of judges that the CMA has acted irrationally, illegally, or with procedural impropriety or unfairness.
If Microsoft wins its appeal, the deal returns to the CMA for review once more, and given the concerns expressed in its decision to block the deal, it seems unlikely the CMA would change its mind to be in favour.