UnionStack vs Microsoft 365
The same enterprise productivity you rely on — with genuine European data sovereignty that Microsoft cannot provide.
Request a Comparison BriefProductivity & Collaboration
| Feature | Microsoft 365 | UnionStack |
|---|---|---|
| Email & Calendar | Outlook / Exchange Online | UnionStack Mail |
| Document Editing | Word / Excel / PowerPoint Online | UnionStack Docs |
| Video Conferencing | Microsoft Teams | UnionStack Meet |
| Team Messaging | Microsoft Teams | UnionStack Chat |
| File Storage | OneDrive / SharePoint | UnionStack Drive |
| Project Management | Planner / Project | UnionStack Projects |
Security & Compliance
| Feature | Microsoft 365 | UnionStack |
|---|---|---|
| Advanced Threat Protection | Microsoft Defender | UnionStack Shield |
| Data Loss Prevention | Microsoft Purview | UnionStack DLP |
| MFA / SSO | Entra ID | UnionStack Identity |
| Endpoint Management | Intune | UnionStack Endpoint |
| Customer-Managed Encryption Keys | Limited (extra cost) | Included |
| Zero-Knowledge Encryption | No | Available |
Data Sovereignty
| Feature | Microsoft 365 | UnionStack |
|---|---|---|
| Data stored exclusively in EU | Available (EU Data Boundary) | Guaranteed |
| No CLOUD Act exposure | No — Microsoft is US-headquartered | Yes — German GmbH |
| No FISA 702 obligations | No — Subject to FISA | Yes — EU law only |
| EU-only staff access | No — Global operations team | Yes — All staff EU-based |
| No US parent company | No — Microsoft Corp (US) | Yes — Independent GmbH |
| Sovereignty audit reports | Not available | Quarterly reports |
| GDPR-native architecture | Retrofit compliance | Built from ground up |
Key Differentiators
True Legal Isolation
As a German GmbH with no US parent entity, UnionStack has no legal obligation to comply with US data access demands. Microsoft, as a US corporation, is legally compelled to comply with CLOUD Act orders — even for data stored in the EU.
Architecture, Not Just Policy
Microsoft's EU Data Boundary is a policy commitment. UnionStack's sovereignty is an architectural guarantee. Our systems are designed so that non-EU access is technically impossible, not just contractually prohibited.
Transparent Operations
We publish quarterly sovereignty audit reports, maintain a complete sub-processor list, and provide customer-managed encryption keys as standard. Microsoft's transparency around government data requests is limited.
Simpler Migration Than You Think
Our automated migration tools transfer email, files, calendars, and contacts from Microsoft 365 with zero downtime. Most enterprises complete the transition in 8-10 weeks with dedicated migration support.
Ready to Make the Switch?
Our migration team has helped hundreds of enterprises transition from Microsoft 365. Most complete the move in 8-10 weeks with zero downtime.