Microsoft 365 Without Microsoft: European Alternatives and Real Migrations in 2026

On December 4, 2025, Microsoft published an official blog post titled "Advancing Microsoft 365" that scheduled significant price hikes for July 1, 2026: Microsoft 365 E3 jumps from 36 to 39 dollars per user per month, E5 from 57 to 60 dollars, Business Standard from 12.50 to 14 dollars. For a 3,000-seat fleet, that is roughly 100,000 dollars of additional annual billing at equivalent licensing. At the same moment, in The Hague, the International Criminal Court was finalizing its switch to openDesk, the German open source suite, for its 1,800 workstations. The decision followed the temporary lockout of prosecutor Karim Khan's Microsoft account in May 2025, after US sanctions in February 2025, the same legal mechanism analysed in our CLOUD Act deep dive.

These two events, with no obvious connection, tell the same story. Microsoft 365 has become too expensive, too critical and too politically exposed to remain a default choice. The right question in 2026 is no longer "should we leave Microsoft 365?" but "how do we rebuild an equivalent stack in Europe, function by function?"

Why M365 isn't a suite, it's a family of 15 products

Microsoft 365 sells integration. Under the hood, it is 15 distinct building blocks: Word, Excel, PowerPoint for office productivity, Outlook and Exchange for email and calendar, Teams for messaging and video, OneDrive and SharePoint for storage and document management, Entra ID (formerly Azure AD) for identity, Power BI for analytics, Power Automate for workflows, Forms for forms, and half a dozen more peripheral tools. Each has a mature European equivalent in 2026. The lock-in is not technical, it is organizational: recomposing these 15 bricks requires an engineering team, a migration strategy and a governance that survives electoral cycles. Three concrete cases prove it can be done.

Case 1: Schleswig-Holstein, 30,000 workstations nearly migrated

In April 2024, Ministerpräsident Daniel Günther and Digital Affairs Minister Dirk Schrödter announced the migration of the Land's 30,000 administrative workstations to LibreOffice, Linux, Nextcloud, Open-Xchange and Thunderbird. On December 4, 2025, in an official Staatskanzlei communication, Schrödter delivered a precise progress report: "On nearly 80 percent of all workstations, outside the tax administration, and across all ministries, the open source office software LibreOffice is now in use. Microsoft Office and Outlook have already been uninstalled or are being uninstalled." 44,000 email inboxes have moved to Open-Xchange. ODF became the official file format on August 1, 2024.

The economic balance sheet is public and quantified: more than 15 million euros in licenses already saved against a one-time investment of 9 million euros budgeted for 2026 covering migration, training and open source co-development. Payback period: less than one year. Three success factors. The strategy is carried by the Ministerpräsident himself, which protects it from municipal coalition shifts. User support is tiered (Dataport at level 1-2, riess applications and allotropia at level 3). And the tax administration was deliberately excluded from scope, because its Excel dependencies are considered non-substitutable in the short term.

Case 2: French Gendarmerie, 18 years of quiet migration

GendBuntu remains, in 2026, the oldest and largest public European migration off Microsoft. The Ubuntu-derived distribution, deployed since 2008 after the end-of-Windows-XP announcement, equipped 103,164 workstations in June 2024, or 97 percent of the corps' fleet. Full stack: Ubuntu, LibreOffice, Thunderbird, Firefox, GIMP. Estimated savings from the start were around 2 million euros per year in avoided licenses on office software alone, and the European Open Source Observatory reported as early as 2013 a 40 percent reduction in total cost of ownership.

The success factor is not technical. Colonel Nicolas Géraud put it succinctly in 2013: "Migrating 70,000 workstations to Linux is a non-event for us." The workstation is treated as a commodity; budget and human effort are concentrated on business applications. Natural hardware refresh serves as the migration vector. All new gendarmes go through training schools where Linux is the standard. When a migration runs for 18 years, it does not make headlines. It builds itself.

Case 3: DINUM and LaSuite numérique, the fastest trajectory in Europe

Driven by the French interministerial digital agency under Stéphanie Schaer, LaSuite numérique brings together in May 2026: Tchap (encrypted messaging on Matrix protocol), Visio (videoconferencing based on Jitsi, hosted by Outscale on SecNumCloud), Docs (collaborative editing), Grist (spreadsheets and no-code), Fichiers, France Transfert, Messagerie, Audioconf, and an AI Assistant plugged into Mistral. More than 500,000 active public servants per month, 600,000 registered users on Tchap, 60,000 weekly meetings on Visio, deployed across 15 ministries.

Two political decisions in early 2026 accelerated the curve. On January 27, 2026, Minister David Amiel announced the mandatory rollout of Visio to all State services by 2027, with estimated savings of 1 million euros per year for every 100,000 users switched from Teams or Zoom. On April 8, 2026, an interministerial directive from DINUM, DGE, ANSSI and DAE required every ministry and public operator to present a roadmap for reducing dependencies on extra-European providers before autumn 2026. Early Q1 2026 adopters: CNRS (34,000 staff and 120,000 researchers switched from Zoom), Assurance Maladie, Ministry of the Armed Forces.

The opening of LaSuite to European organisations outside French public administration is on the 2026 roadmap. The code is already open source.

The mirror case: Munich (LiMux), required reading before signing

LiMux launched in 2003, was deployed on about 15,000 municipal workstations between 2006 and 2013, and according to November 2012 municipal reports saved more than 11 million euros in licenses. In November 2017, the Munich city council, under pressure from SPD mayor Dieter Reiter (elected in 2014, publicly self-described as a "Microsoft fan" and instrumental in installing Microsoft's German headquarters in Munich in 2016), voted to return to Windows 10 across roughly 29,000 workstations. Announced cost of the return: around 17 million euros.

The Accenture report that justified the decision, commissioned by a city hall housed in the same building as Accenture and Microsoft Munich, identified problems of fragmented IT governance, lack of clear structures and inadequate inter-service communication. No technical defects of Linux or LibreOffice. The Free Software Foundation Europe has never stopped pointing this out. Schleswig-Holstein drew the lesson: anchor the strategy at the Ministerpräsident level, not the Bürgermeister level.

The EU stack in 2026, function by function (an honest verdict)

Office productivity (Word/Excel/PowerPoint): LibreOffice 25.8 (The Document Foundation, Berlin) remains the reference. Collabora Online (UK/Germany), built on LibreOffice, is the enterprise option and the productivity layer of openDesk. OnlyOffice (Ascensio System SIA, registered in Latvia) offers the best Microsoft compatibility but remains politically controversial: Nextcloud and IONOS announced in late 2025 the "Euro-Office" fork to remove dependency on an editor whose developers largely reside in Russia.

Email and calendar: Open-Xchange App Suite is the standard in the German public sector. For SMBs, Proton (Switzerland, certified SOC 2 Type II in July 2025, more than 100,000 corporate customers), Tuta Mail (Hanover, over 10 million users, 148 percent paying customer growth between July 2024 and February 2025), Mailbox.org, Infomaniak Mail and Mailfence cover B2B needs, as detailed in our European email providers guide.

Messaging and video: Element on the Matrix protocol is now the backbone of the German and French public sectors. BwMessenger (100,000+ Bundeswehr users, BSI-certified for VS-NfD since July 2021), BundesMessenger, Tchap (600,000 agents). Tixeo (Montpellier) remains the only French editor with both SecNumCloud and CSPN certifications for video.

Storage and document management: Nextcloud (Germany) claims to be the only serious Microsoft 365 alternative in Europe. Deutsche Telekom migrated 2.2 million MagentaCLOUD users and 7.2 petabytes of data. Leviia deployed Nextcloud for 550,000 users in the Île-de-France region. ownCloud Infinite Scale, Tresorit (acquired by Swiss Post), kDrive (Infomaniak) and pCloud round out the options.

Identity (Entra ID): Univention Corporate Server (Bremen) is the central IAM in openDesk and most German public sovereign deployments. authentik and Keycloak cover SSO and OIDC. This is the function where Microsoft lock-in remains hardest to undo at scale.

Workflows and automation: n8n (Berlin) announced on October 9, 2025 a 180 million dollar Series C led by Accel, bringing its valuation to 2.5 billion dollars. 3,000 enterprise customers including Microsoft itself, Vodafone and Delivery Hero. Make (Czech Republic) remains the more accessible option.

Analytics and BI: this is Europe's weak point. Metabase and Apache Superset self-hosted in an EU cloud remain the most mature options to replace Power BI. Toucan Toco and Serenytics cover business dashboard use cases.

Forms: Tally (Belgium), Typeform (Spain), Cryptpad Forms (XWiki/INRIA) and Framaforms cover Microsoft Forms needs.

EU rulings 2024-2026: the legal ground has shifted

On September 12, 2025, the European Commission (Teresa Ribera) accepted Microsoft's commitments on Teams, making them legally binding for seven years (ten for interoperability and portability). Microsoft must now offer Office 365 and Microsoft 365 versions without Teams at a significantly lower price, allow EEA customers to switch to these versions, guarantee interoperability with competing tools, and enable Teams data export. A trustee monitors implementation. Maximum penalty for breach: 10 percent of global turnover. For the first time since the 2004 antitrust ruling, Microsoft is legally compelled to unbundle.

On data protection, the German Datenschutzkonferenz has maintained since November 24, 2022 that Microsoft 365 does not allow demonstration of GDPR compliance in standard configuration. On March 11, 2024, the European Data Protection Supervisor declared that the European Commission itself was violating GDPR through its use of Microsoft 365 and ordered remediation by December 9, 2024.

What to do, in practice

For a European SMB or scale-up, the most effective attack is "two quick bricks". Phase 1, within three months: replace Outlook/Exchange with Proton Workspace or Tuta Business, and replace Teams with Element or Tixeo. These two bricks cover about 60 percent of Microsoft 365's value without touching identity or office productivity. Phase 2, within nine months: Nextcloud for storage and document collaboration. Phase 3, within 18 months: Collabora Online or LibreOffice client for production office work. Keep Microsoft licenses for the 10 to 15 percent of business users dependent on advanced Excel or Power BI.

For mid-market or large enterprises, the doctrine is Schleswig-Holstein's: decision anchored at the executive committee, ODF as the pivot format, internal migration team of five to eight FTEs, level 3 support contract with a European open source integrator. Budget target: 300 to 500 euros per workstation over 24 to 36 months. For a broader view on building a fully European SaaS stack, see our European SaaS stack guide.

For large accounts or public administration, openDesk or LaSuite numérique depending on jurisdiction. The next Enterprise Agreement renegotiation, combined with the July 1, 2026 Microsoft price hike and the September 2025 antitrust commitments opening access to Office 365 without Teams, makes the economic case for European alternatives significantly stronger than it was in 2022.

The debate is no longer whether leaving Microsoft 365 is possible. Schleswig-Holstein, the Gendarmerie and DINUM prove it is. The debate is whether your organisation has the governance, the engineering team and the patience to get there without replaying Munich.