I don't think that Github and Azure DevOps will merge anytime soon. Github actions are still quite limited. For example, you can still only build .NET Core projects and not .NET Framework with Actions. Also, the whole project management thing in DevOps is way more advanced than Github issue tracking.
But in the long run I don't think it makes sense for Microsoft to maintain both systems.
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Yes, Microsoft has changed a lot since Ballmer.
I don't think that Github and Azure DevOps will merge anytime soon. Github actions are still quite limited. For example, you can still only build .NET Core projects and not .NET Framework with Actions. Also, the whole project management thing in DevOps is way more advanced than Github issue tracking.
But in the long run I don't think it makes sense for Microsoft to maintain both systems.