La Data sovereignty has become one of the biggest headaches For European governments and organizations that rely daily on services from Microsoft, Google, or Amazon. We're not just talking about GDPR compliance "on paper," but something much deeper: who truly controls the infrastructure, who can access the information, and under what laws are those decisions made?
While the EU promotes strategies of digital autonomy, cybersecurity and resilienceThe reality is that a large part of its technological backbone runs on US clouds. In this context, Microsoft has accelerated its commitment to a sovereign cloud ecosystem in EuropeTrying to square the circle: continue leading the cloud market while also responding to the political, legal and trust demands of European institutions.
What does data sovereignty mean in the Microsoft ecosystem?
When we talk about data sovereignty, we're not just referring to where the data is physically storedbut to something more delicate: what jurisdiction can impose its law on them, who decides whether a service is blocked, limited or disconnected, and what real room for maneuver do customers have to resist external pressures.
In the case of Microsoft, this issue is especially sensitive because its productivity solutions —Microsoft 365, Outlook, Teams, SharePoint, OneDrive— and its cloud infrastructure with Azure dominates computing in the European public sector. This creates a paradox: institutions that must apply the highest data protection standards depend on platforms that are also subject to US legal framework, including legislation on data access by US authorities.
In the background, there appears to be a clash between the General Data Protection Regulation (GDPR) and regulations such as the US CLOUD ActThis agreement requires US providers to hand over data to US authorities even when that data resides in European data centers. Although the current EU-US Data Privacy Framework (DPF) aims to close this gap, many experts consider its safeguards insufficient and anticipate further litigation that could once again leave organizations in a legal limbo.
Microsoft attempts to respond with a sovereign cloud strategy for Europe It introduces technical, organizational, and contractual layers to strengthen local control over data, without sacrificing the scale and innovation of its global cloud ecosystem. This is the foundation upon which the Microsoft Cloud Sovereign concept is built.
Microsoft Sovereign Cloud: architecture, features, and objectives
The call Microsoft Cloud Sovereign It is, in essence, a suite of Azure and Microsoft 365 services configured to meet the legal, regulatory, and operational requirements of regions such as the European Union. It is specifically geared towards public administrations, critical infrastructures and highly regulated sectors such as health, finance, defense, or justice.
The central idea is to ensure that the Data is processed and stored entirely within European territoryUnder EU law and with additional controls on who can access them and from where. This approach is not limited to storage: it also encompasses artificial intelligence processing, administrative operations, access monitoring, and business continuity mechanisms.
In this new phase of expansion in Europe, Microsoft has extended this sovereign logic to its entire cloud offering in the region, including Azure, Microsoft 365, and advanced AI services. This means that organizations can work with AI models, data analytics, and mission-critical workloads within a single, unified environment. “EU Data Perimeter” in which the information does not leave the region except by express decision of the client.
The approach relies on a combination of local infrastructure reinforced (more data centers and greater capacity), new sovereignty-oriented services (Data Guardian, external key management, Microsoft 365 Local) and governance changes (European legal entities, local board of directors, resilience and continuity commitments).
End-to-end resilience and operational continuity
One of the key elements of data sovereignty is the ability to continue operating even in extreme scenariosWhether it's a technical catastrophe, a geopolitical crisis, or a legal conflict that threatens to disrupt services, Microsoft has articulated an end-to-end resilience strategy for its European clouds.
On a purely technological level, the company highlights its global infrastructure, Availability Zones, regions with geographical redundancy and business continuity plans that are tested regularly. These high-availability layers allow for the design of fault-tolerant architectures that minimize the risk of technical disruptions.
Beyond the technical aspects, Microsoft is establishing contingency agreements with designated European partners To ensure operational continuity even in the hypothetical case that a court orders the suspension of its services in the region. The idea is that the operation of certain national or sector-specific clouds can be maintained thanks to local entities that assume critical management functions.
In October 2023, the company publicly committed to to legally challenge any order that forces the suspension of its cloud operations in Europe They have already created a legal entity based in the EU responsible for operating their cloud services under EU law. These commitments aim to provide additional safeguards against the risks of unilateral external decisions.
At the same time, Microsoft has incorporated disaster recovery mechanisms and disconnected operating modesdesigned for organizations that need to be able to continue operating even without a connection to the global network, something especially relevant for essential services or critical infrastructures.
Specific tools to strengthen sovereignty: Data Guardian, external keys, and Microsoft 365 Local
Microsoft's sovereign cloud proposal takes shape in several new tools designed to strengthen the local control over data and transparency in accessOne of the most prominent is Microsoft Data Guardian.
Data Guardian acts as a additional layer of monitoring for remote access to sensitive data. Any intervention by Microsoft engineers on systems that store or process information in Europe must be approved by EU-based personnel and is recorded in an unalterable audit system. This way, organizations can see who accesses the data, when, and for what purpose, reducing the feeling of a "black box" in cloud management.
Along with Data Guardian, Microsoft offers a system of External Key ManagementWith this feature, customers store and manage their keys on their own hardware or on security modules managed by trusted third parties. The practical consequence is that Microsoft cannot decrypt the content without the customer's active cooperation, thus reinforcing confidentiality against potential external requests for data access.
Another relevant component is Microsoft 365 Local, a localized version of the productivity suite It can run entirely in on-premises or authorized partner data centers, and even be integrated into Azure On-Premise within a sovereign private cloud architecture. This allows applications like Exchange, SharePoint, or Skype for Business to operate under strict data residency and sovereignty criteria.
To facilitate management, Microsoft also adds a layer of centralized management of regulated environmentswhere access policies can be defined, controls configured and compliance monitored from a single panel, something key for organizations that operate in several European countries with complex regulations.
Private sovereign cloud and Azure On-premises: maximum control for critical sectors
For those organizations that are not satisfied with a sovereign public cloud and need a extreme level of isolation and controlMicrosoft has developed the Private Sovereign Cloud option based on Azure Local.
Azure Local allows deploy cloud services within the customer's own premises or in certified third-party data centers, while maintaining compatibility with the Azure ecosystem. In this model, data and workloads remain within the country or even within the organization's physical perimeter, which is especially attractive for central banks, hospitals, armed forces, or security agencies.
In this architecture, the combination of Azure Local with Microsoft 365 Local allows both infrastructure such as the collaboration and productivity layer They run in physically and logically isolated environments, with customized security policies that can be adjusted in real time without relying on global data centers.
In terms of capabilities, Microsoft has increased the maximum scale supported by Azure LocalThis now allows for the deployment of hundreds of physical servers and offers support for SAN networks, facilitating integration with existing enterprise storage systems. Furthermore, it incorporates the NVIDIA RTX Pro 6000 Blackwell Server Edition GPU to accelerate AI workloads.
This opens the door to execution within the sovereign perimeter thousands of artificial intelligence modelsincluding GPT OSS, Mistral NeMo, or Llama 4 Maverick, without removing data from the controlled environment. This allows organizations to experiment with generative AI, advanced analytics, or intelligent automation while maintaining strict regulatory compliance.
European boards of directors, data centers and security
Sovereignty is not achieved through technology alone: it also requires changes in the governance and oversightTherefore, Microsoft has created a European board of directors made up entirely of EU citizens, responsible for overseeing the operations of its data centers on the continent.
This body's mission is to ensure that the European cloud infrastructure management aligns with EU legislation and policy prioritiesThis includes aspects such as data protection, cybersecurity, resilience, and operational transparency. The aim is to shift some of the decision-making "center of gravity" to the region itself.
In parallel, Microsoft continues to expand its data center footprint in EuropeWith new facilities in countries like Austria and Belgium, and with the promise to double the capacity of its European data centers between 2023 and 2027 through investments of “tens of billions of dollars a year,” this expansion aims to meet the growing demand for cloud computing while simultaneously bringing services closer to European users.
Another pillar of the strategy is the European Security ProgrammeThis initiative combines AI-based cybersecurity tools with training programs to strengthen the defenses of governments and organizations against digital threats. Microsoft also continues to fund open-source software projects aimed at improving security and technological collaboration in the region.
All these elements are integrated into a cloud services offering for the public sector where contracts include explicit commitments to digital resilienceoperational continuity and regulatory compliance, attempting to respond to the concerns of regulators and policymakers.
Europe's structural dependence on Microsoft and other big tech companies
While Microsoft refines its sovereign cloud proposal, several studies underline an uncomfortable fact: Europe's structural dependence on major US technology companieswith Microsoft in a clearly dominant position.
A report by the Open Cloud Coalition (OCC) estimates that Microsoft's market share in productivity software in the EU public sector is around 77% globallyreaching up to 90-92% for office software in some Member States and around 84% for collaboration tools. In other words, in many ministries, courts, hospitals, and educational institutions, Microsoft is practically the default choice.
Procurement data from Tenders Electronic Daily (TED) shows that, in public tender and award announcements, Microsoft is mentioned far more than any competitor.with incidence rates ranging from 72% to 91% in 2023 and skyrocketing to the 89-100% range in some segments in 2024. This reinforces the idea of a highly concentrated ecosystem.
In the specific area of collaboration and videoconferencing, the picture is similar: US companies outperform 88% market share In the EU, tools like Microsoft Teams, Google Meet, Zoom, and Slack dominate institutional deployments. Again, TED data reflects that these platforms account for the vast majority of mentions in tender documents.
This concentration is reinforced by recruitment practices such as recurring repurchase from established suppliersThe compatibility requirements with existing systems or the integrated software packages make the shift to European alternatives extremely difficult. Several analysts have warned that Europe is "sleepwalking" towards an even greater dependence on Microsoft's cloud technologies.
Legal and political risks: from the CLOUD Act to the ICC email scandal
The underlying problem is not just economic or related to competition; it is also legal and geopoliticalThe US Cloud Act, in force since 2018, obliges companies such as Microsoft, Google or Amazon to provide data to US authorities when there is a valid order, even if the data is stored on servers located in Europe.
This may conflict with GDPR principles such as purpose limitation, minimization, and protection against disproportionate surveillanceThe DPF attempts to reconcile both worlds, but its predecessors —Safe Harbor and Privacy Shield— were already struck down by the Court of Justice of the EU for not offering sufficient guarantees against US surveillance, and numerous experts predict that the DPF will also end up in court.
A particularly illustrative example of this tension is the case of blocking of the email account of the chief prosecutor of the International Criminal Court (ICC), Karim KhanAccording to the Associated Press, in May 2025, its account was blocked without prior notice, forcing the ICC to migrate to another provider (Proton). This occurred after the Trump administration imposed sanctions on the ICC for its investigations into Israel.
Microsoft denied having completely suspended services, but did acknowledge that it had to fulfill their legal obligations under US regulationsThe incident raised alarm bells in Europe: if a political decision in Washington can, de facto, disable or hinder the work of an international judicial institution, what could happen to ministries, parliaments, or central banks heavily reliant on infrastructure from non-EU providers?
These types of incidents add to other cases, such as a US court order requiring OpenAI to preserve all ChatGPT logs, including deleted chats and confidential data sent through its commercial API. Beyond the copyright debate, these decisions raise questions about the degree of control that foreign powers can exert over services used daily in Europe.
Contradictions in public procurement and a lack of real support for European alternatives
The reports from the OCC and other observers hit the nail on the head: while Europe loudly proclaims its digital sovereignty agendaIn practice, public procurement continues to overwhelmingly favor American big tech companies.
Competitions are often designed with interoperability requirements, closed packages, and automatic renewals This reinforces the dominance of Microsoft, Google, and Amazon. This leaves many European providers—who are not lacking in technical capacity or innovation—in a marginal position, without sufficient contract volume to scale their solutions and compete on equal footing.
While taxpayer money fills the coffers of major American players, the European software SMEs struggle to gain visibility In an environment where administrations prioritize the "security" of sticking with a known provider, a vicious cycle is created: the more widespread an ecosystem like Microsoft's is, the harder it is to justify the cost of switching to another.
Paradoxically, the EU is promoting initiatives like GAIA-X and the European Data Strategy to foster a viable, homegrown cloud industry, but without structurally changing how technology is procured in the public sector. Mandatory criteria in tenders that value sovereignty, jurisdiction and support for European suppliersPolitical discourse risks becoming mere institutional marketing.
The result is a strategic dependence that can become especially dangerous in times of crisis, when a government's ability to act autonomously may depend on the technical decision of a foreign company or the interpretation that a court in another country makes of its national interest.
Examples of regulatory tension within the EU: from the use of Microsoft 365 to the healthcare cloud
European data protection authorities have also begun to set limits on the use of US services in certain contexts, particularly when there are especially sensitive or minor data involved.
In Germany, some regional authorities have gone so far as ban the use of Microsoft 365 in schools and administrations due to doubts about its compliance with the GDPR and the risk of data transfers to the US. Similar cases have been seen with Google Workspace and Chromebooks in Danish educational centers, where restrictions have been issued for data protection reasons.
In France, the selection of the insurer ALAN—which hosts data on Amazon Web Services—to manage supplementary health insurance for civil servants has generated parliamentary controversy. Some members of parliament have questioned whether delegating this task is consistent with the government's own digital sovereignty guidelines. confidential health data in a cloud subject to the Cloud Act, even raising the need to migrate to a sovereign cloud.
Also in the healthcare sector, the French CNIL authorized the European Medicines Agency (EMA) to conduct an epidemiological study project, “DARWIN EU,” in which data from 10 million French people would be stored on Microsoft. Despite acknowledging that the risk of [unclear] could not be entirely ruled out access from the United States through the matrixThe CNIL considered that the pseudonymization measures, certifications (such as HDS) and the agreed guarantees reduced the risk to an acceptable level.
These decisions illustrate the delicate balance that the authorities are trying to maintain between harness the power of global platforms and to protect the fundamental rights of European citizens, in an international legal context that is far from simple.
European alternatives and complementary ecosystem to Microsoft
Faced with this scenario, some European suppliers are presenting themselves as truly sovereign alternatives for certain layers of the digital infrastructure, especially in communications, videoconferencing or hosting of sensitive data.
A representative case is that of Digital Samba, a videoconferencing platform developed entirely in Europe that emphasizes the exclusively European jurisdiction of the dataAll information — video, audio, chat, metadata — is stored in data centers located in the EU, subject to the GDPR and supervised by European authorities, without direct exposure to laws such as the Cloud Act.
The solution offers end-to-end encryption, flexible SDK and APIs for deep integration into proprietary applications, and a privacy-focused development approach. It thus serves as an example that it is possible to build world-class communication infrastructures without sacrificing sovereignty or data protection.
However, these types of platforms often start at a disadvantage in public procurement processes, where administrations tend to prioritize large, established suppliersWithout fundamental changes in purchasing policies and evaluation criteria, European alternatives will remain niche players, however solid they may be from a technological or legal point of view.
The European Commission itself acknowledges that it is probably no longer realistic to create “systemic competitors” from scratch capable of rivaling the large US hyperscalers in scale, but insists that Europe must maintain a viable proprietary cloud industry and actively support reliable “sovereign cloud” solutions, both through funding and through mandatory procurement standards.
The evolution of data sovereignty in the Microsoft ecosystem and in the European market as a whole will largely be played out in this intermediate terrain: Strengthened sovereign public clouds, highly controlled private cloud options, partnerships with national operators And, in parallel, a network of specialized European providers offering service layers where jurisdiction and trust are essential. If the EU truly aligns its procurement, regulatory, and innovation support policies with this objective, European digital autonomy will cease to seem like a pipe dream and become a tangible and sustainable strategy.
