Email · Germany (DE)
Open-Xchange
European communication and collaboration platform for telcos and ISPs.
The switch
Microsoft 365→Open-Xchangealso replaces Google Workspace
About
OX App Suite provides webmail, calendar, contacts, documents and drive — powering 1&1, Strato, GMX and other European providers.
Why we recommend it
- Used by major EU telcos
- GDPR-compliant by design
- Open standards (IMAP, CalDAV)
- On-prem or hosted
EU vs USA
Open-Xchange vs Microsoft 365
Side-by-side on jurisdiction, data residency, and the rules that decide who can actually read your data.
Criteria
🇪🇺 Open-Xchange
🇺🇸 Microsoft 365
Headquarters
Cologne, Germany
Redmond, USA
Jurisdiction
Germany (GDPR)
USA
Data location
EU datacenters
Global
GDPR-native
Yes
No
CLOUD Act / FISA exposed
No
Yes
Ad tracking
No
No
End-to-end encryption
No
No
Open source
Yes
No
Ownership
Open-Xchange AG
Microsoft Corp.
Founded
2005
2011
Compare head-to-head