Microsoft has announced that Office 365 to European data protection provisions for data storage requirements. It would be the first cloud-based are that. Or the American authorities in the European data, is unclear.
In addition, Microsoft has an online trust center opened where information can be found about the way Microsoft handles information. Thus it can be seen that the data of Dutch companies in the European Union may leave, for example for storage on a backup server. To this end, the Microsoft itself of the safe harbor agreement between the EU and the US. The agreement is intended to differences between U.s. and European privacy laws to be lifted for European data by American companies to be processed.
From the available information does not show if Microsoft European data transfers to the Us authorities when requesting it. The company is required to do so pursuant to the usa Patriot Act. Microsoft got recently compromised when a Microsoft official suggested that the company could not guarantee that no data would transfer.