Sadly not. The US courts have already ruled that data held in other data centres are fair game for a US warrant [1]. In this case the data is held in the EU (in Dublin, Ireland to be precise) and MS was found in contempt of court for failing to hand the data over [2]. They're still fighting this case now - over a year later - and it's currently in the 2nd Circuit Court of Appeals [3].

This means that the precedent is already set. If the company operates in the US and is served a warrant, the US Govt wants ALL of the data WHEREVER it's held.

I'm rooting for MS on this one and hope their appeal is upheld.

[1] http://www.theguardian.com/technology/2014/apr/29/us-court-m...

[2] http://www.zdnet.com/article/microsoft-refuses-to-hand-over-...

[3] http://www.techweekeurope.co.uk/e-regulation/microsoft-resis...