Re: They already have a legal route
Microsoft employees based in the US can
Microsoft Ireland is a separate legal entity and Microsoft US employees have no access to its resources, save those that Microsoft Ireland grants. Ultimately, the directors of Microsoft Ireland are responsible for decisions the company makes - those directors may not all be Irish citizens but they are still accountable to Irish law. They can't use the defence that Microsoft employees elsewhere locked them out of their own company - if they're not in control as directors then the company would be a sham in which they're willing participants.