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In a recent hearing before the French Senate, Microsoft France's CEO, Anton Carniaux, and his colleague Pierre Lagarde, acknowledged that the company cannot guarantee that European users' data will remain solely within Europe. Despite implementing various measures to enhance data sovereignty, U.S. legislation, particularly the CLOUD Act, could compel Microsoft to provide data to U.S. authorities, even if that data is stored within European borders.
This admission underscores a longstanding concern: U.S. cloud providers, including Microsoft, AWS, Google, and Oracle, are subject to American laws that may override their commitments to data residency. The CLOUD Act allows U.S. authorities to access data held by U.S. companies, regardless of where the data is physically stored. This legal framework poses challenges for European entities seeking to ensure that their data remains protected under EU regulations.
Microsoft has made significant efforts to address these concerns. The company announced the EU Data Boundary for the Microsoft Cloud, aiming to store and process all personal data of EU customers within the EU. This initiative covers core cloud services such as Azure, Microsoft 365, and Dynamics 365. (blogs.microsoft.com) Additionally, Microsoft introduced the Microsoft Cloud for Sovereignty, designed to provide public sector customers with greater control over their data. (blogs.microsoft.com)
However, these measures have limitations. While data residency ensures that data is stored within a specific geographic location, it does not necessarily protect against extraterritorial access requests. As noted by experts, the CLOUD Act grants U.S. authorities access to data held by U.S. companies, irrespective of its location. (theregister.com)
The European Union has been actively seeking to enhance its digital sovereignty. Initiatives like the EU Data Boundary and partnerships with European cloud providers aim to reduce dependence on U.S. tech giants. For instance, Microsoft has collaborated with European companies to offer services operated under European control, such as the joint venture with Orange and Capgemini in France. (blogs.microsoft.com)
Despite these efforts, the fundamental issue remains: as long as U.S. cloud providers are subject to American laws, they cannot fully guarantee data sovereignty for European customers. This reality prompts European organizations to carefully consider their cloud strategies, balancing the benefits of using established U.S. providers against the risks associated with potential data access by foreign authorities.
In conclusion, while Microsoft and other U.S. cloud providers have taken steps to enhance data residency and sovereignty within Europe, legal obligations under U.S. law present inherent challenges. European entities must weigh these factors when deciding how to manage and store their data, considering both the technical capabilities and the legal frameworks governing their chosen cloud services.

Source: Techzine Global As expected, Microsoft cannot guarantee data sovereignty in the EU