Microsoft in Ireland may be a wholly owned subsidiary, but it is a separate legal entity operating under the laws of Ireland, and incorporated under Irish law. You can't bypass the Irish courts because Microsoft US owns Microsoft Ireland.
If I own a car located in Sweden, and I'm a US citizen in the US, arrested in the US... can the court compel me to make arrangements to produce for the court something in that car's glove box? I don't actually know...could one? Its not entirely unreasonable to speculate that they could make that demand and then hold me in contempt if I refused to make that arrangement.
Microsoft in Ireland may be a wholly owned subsidiary, but it is a separate legal entity operating under the laws of Ireland, and incorporated under Irish law.
According to you, it is also the legal property of Microsoft US. They don't need to compel the Irish to do anything. They can (arguably) simply compel the US entity in their jurisdiction to summon its own property.
If corporations are legally people [...]
They are clearly not the same as human people. For starters, you can own them as property.
Microsoft Ireland is 100% subject to applicable Irish law.
It is also subject to the orders of its owner, what with it being property and all. So as long a Microsoft US doesn't demand that it do something illegal by Irish law, it has to do whatever Microsoft US tells it to do.
I'm not arguing that you are "wrong" merely that your argument omits the crucial element of property ownership in play.
If so, this boils down to can a court compel a property owner to direct his property to do something (such as forward a document in that properties possession), even if the property happens to be in another country? (one could also substitute "property" for "slave" in that sentence... and
When looked at like that, its not really ridiculous at all.
This is not a case of a court making demands directly of an Irish citizen; which is the possible strawman you erected. This is the case of a court making demands of a US corporation. The nature of that demand is that the US corporation in turn compel its own property in Ireland to do its bidding.
It might seem equivalent in the end, but they are NOT the same thing. For example there is no way the courts in the USA can compel ME to do anything because I am not in the USA, nor am I the legal property of any entity in the USA.