The European Alternative to Microsoft 365
Self-hosted, open source, GDPR-compliant office suite. Deployed on your own servers — your data never leaves your infrastructure.
The Problem
Why organizations need an alternative
Dependence on Foreign Providers
Organizations rely on US-based cloud providers, losing control over their data.
CLOUD Act & Data Leaks
Your data can be accessed by foreign governments without you even being notified.
Licensing Costs
Microsoft 365 licenses cost thousands of euros annually, with yearly increases.
6 Pillars That Replace Microsoft 365
A complete office suite, self-hosted, zero license fees.
Sovereign Files
Secure file storage, sync and sharing. Access from anywhere.
Replaces OneDrive / SharePointSovereign Talk
Private video calls, chat and webinars with end-to-end encryption.
Replaces Microsoft TeamsSovereign Groupware
Email, Calendar and Contacts in one platform.
Replaces Outlook / ExchangeSovereign Office
Collaborative document, spreadsheet and presentation editing.
Replaces Word / Excel / PowerPointSovereign Flow
No-code workflow automation.
Replaces Power AutomateSovereign Assistant
Local AI — your data never leaves your server.
Replaces Microsoft CopilotWhy Sovereign Office Suite
Digital Sovereignty
Self-hosted — your data stays on your servers. You decide where and who has access.
GDPR & EU Compliance
Designed from the ground up for GDPR, no metadata leaks. Suitable for air-gapped environments.
Zero License Costs
100% open source (AGPL). Download, install, and use freely.
European Technology
German company, European development. No dependency on US-based vendors.
Sovereign Office Suite vs Microsoft 365 vs Google Workspace
| Feature | Sovereign Office | Microsoft 365 | Google Workspace |
|---|---|---|---|
| Cost (100 users/year) | ~€10,000 | ~€27,360 | ~€16,560 |
| Open Source | |||
| Data Location | Your servers | Microsoft cloud | Google cloud |
| GDPR Compliance | ⚠️ | ⚠️ | |
| Air-Gap | |||
| AI Assistant | Local AI | Cloud (Copilot) | Cloud (Gemini) |
| Vendor Lock-in | |||
| Desktop Clients | |||
| Mobile Clients |
LOCAL ARTIFICIAL INTELLIGENCE
AI That Thinks — Without Your Data Leaving
The Sovereign Assistant runs locally on your own servers. No query, no document, no data is ever sent to third parties. The AI operates exclusively within your infrastructure.
- On-premise AI — data stays in your building
- Full GDPR, NIS2, and EU AI Act compliance
- Replaces Microsoft Copilot without cloud dependency
Sovereign Assistant vs Microsoft Copilot
* Microsoft Copilot sends data to Azure cloud. Sovereign Assistant does not.
Our Services
We handle installation, configuration, and support.
Installation
Docker deployment, LDAP/AD integration, SSO, branding with your logo.
Migration
Secure transfer from SharePoint, OneDrive, and Exchange.
Training
Admin and end-user training for a smooth transition.
Security & Compliance
Hardening, GDPR compliance mapping, penetration testing.
AI Integration
Installation and configuration of the Sovereign Assistant.
Ongoing Support
Updates, monitoring, troubleshooting, SLA.
Calculate Your Costs
Compare annual costs for your organization.
Sovereign Office
€10,000
/ year
Microsoft 365
€27,360
/ year
Google Workspace
€16,560
/ year
Savings 63% vs M365
Trusted By
ITZBund
🇩🇪 Germany
Modern, easy-to-use solution for online collaboration
Ministry of Interior
🇫🇷 France
Secure solution from the leading European vendor
BMWET
🇦🇹 Austria
Strengthens data control in the public sector
Deutsche Telekom
🇩🇪 Germany
Enterprise deployment at scale
Sorbonne University
🇫🇷 France
Academic use in research environments
Serbian Parliament
🇷🇸 Serbia
Government use with high security requirements
City of Geneva
🇨🇭 Switzerland
Municipal use for citizen services
Amnesty International
🌍 Global
Protection of sensitive data at global scale
Ready for Digital Sovereignty?
Book a demo and see how the Sovereign Office Suite is deployed on your infrastructure.