Microsoft appeals against ruling that US companies must disclose personal information held overseas.
The US Electronic Communications Privacy Act (ECPA) allows US law enforcement to force communications service providers to search for and seize the personal emails of their customers.
In April this year, a New York district judge ordered Microsoft to disclose the personal communications of a customer held on servers in Dublin, rejecting Microsoft's argument that the scope of the power under the ECPA is limited to information held in the US.
Microsoft has recently appealed to the US Second Circuit Court of Appeals against this decision, again arguing that the ECPA should not be interpreted as having "extra-territorial" application- i.e. that it should not apply to information held outside the US.
The European Commissioner for Justice has also expressed concern at the ruling, stating that it may be in breach of international law and inconsistent with the protection of individuals guaranteed in the EU.