tech from europe
vsMicrosoft 365

mailbox.org vs Microsoft 365

Last updated August 2026

Looking for a European alternative to Microsoft 365? Here's how mailbox.org compares, on EU hosting, GDPR and what it does.

Our pick for a European buyer: mailbox.org. We weight data residency, GDPR and EU jurisdiction above everything else — that is the constraint this directory exists to solve.

mailbox.org
Microsoft 365
What it is
Berlin-based encrypted email, calendar and cloud storage with PGP in the browser and German servers only.
not established
Headquarters
🇩🇪 DE
No
EU data residency
Yes, for all customersBerlin (DE)
not established
DSGVO / GDPR
Yes
not established
Certifications
ISO 27001, BSI C5 Type 1
not established
Price from
€12/mo
not established
Free plan
No
not established
Open Source
No
not established
Ratings
TRUSTPILOT 4.3/5 (122)
No
Integrations
No
not established

We have not yet completed our own research on Microsoft 365; rows above show only what we can evidence. Check the vendor for specifics.

Where each one wins

mailbox.org

Strengths

  • +Strong privacy focus with PGP encryption via Guard or Mailvelope plugin
  • +Clean, user-friendly interface and intuitive setup for secure email
  • +Integrated office suite (text, spreadsheets, presentations) and calendar for team collaboration
  • +Affordable entry point with Light tier at €1/month for secure email
  • +Servers exclusively in Germany, ensuring strict EU data protection (GDPR) compliance
  • +Runs on renewable energy, aligning with sustainability requirements
  • +Supports linking multiple business email accounts for centralized management
  • +High security protocols and transparent data handling practices

Limitations

  • −Limited storage capacity, described as insufficient for business needs
  • −Extended onboarding (3–4 weeks) due to usability issues in the web interface
  • −Prepaid, non-refundable credit model lacks flexibility for some users

Microsoft 365

Review sentiment not yet compiled.

Data residency & compliance

mailbox.org
Microsoft 365
EU data residency
Yes, for all customersBerlin (DE)
not established
Transfer mechanism
Not required — data stays in the EU
not established
DPA
Published →
not established
Sub-processors
not established
not established
Certifications
ISO 27001, BSI C5 Type 1
No

Pricing

mailbox.org

  • Standard €3 per monthEmail, calendar, address book · 10 GB storage (Mail + Drive) · Custom domains supported
  • Standard (Annual Payment) €12 per year (€1 per month equivalent)25% discount compared to monthly billing · Same features as monthly Standard plan · Suitable for long-term users

Pricing varies based on billing cycle and storage upgrades. Additional plans (e.g., Premium) may be available but are not detailed in the research.

Microsoft 365

No published pricing we could verify.

Features

mailbox.org

Email & Communication
Ad-free email with custom domains, PGP encryption for emails, Two-factor authentication (2FA), Spam and virus protection
Productivity Suite
Calendar with CalDAV support, Contacts with CardDAV support, Office suite based on Open-Xchange (text, spreadsheet, presentations), Cloud storage (Drive) with file sharing
Collaboration & Security
Video conferencing (Jitsi-based), End-to-end encryption for sensitive data, EU-hosted servers (Germany), GDPR-compliant data processing

Microsoft 365

Feature breakdown not yet compiled.

See mailbox.org →More Microsoft 365 alternatives