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Open-Xchange is an Official Partner of openDesk! Digital Sovereignty Made Secure and Simple!

The Open Platform for
Business Communication

A carrier-grade alternative to Gmail and Outlook, enabling secure, sovereign email, and
productivity apps at any scale — with full control over data, cost, and platform risk.

Why choose OX
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Powering 220+ million user accounts worldwide.
Trusted by:

Why organisations choose OX

assured_workload_24dp_1F1F1F_FILL1_wght400_GRAD0_opsz24 2Carrier-grade software proven at massive scale

desktop_cloud_stack_24dp_1F1F1F_FILL1_wght400_GRAD0_opsz24 1Full control over data, deployment, branding, and cost

desktop cloud stack icon Designed specifically for service providers and public-sector organisations

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Service Providers

  • Customer and brand ownership
  • Packaging, bundling, and upsell control
  • Multi-tenant, carrier-grade operations
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Public Sector

  • Data sovereignty and jurisdictional control
  • Compliance, auditability, procurement fit
  • Long-term vendor independence
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A modern email experience users
instantly understand

OX delivers a clean, intuitive email, calendar and collaboration experience that feels immediately familiar to users - designed for everyday work across desktop and mobile.

The Leader in Open Email Platforms

With more than 220 million users, and a global customer base including some of the biggest telcos and hosters in the US and Europe, Open-Xchange is the largest independent email provider in the world. The OX App Suite Cloud email platform is the perfect choice for providers asking themselves “ Where do we take email now? ”

Our flexible packaging allows you to deliver a premium email experience tailored to your audience, with a business model that keeps you firmly in control of your business success.

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The next level of email communication

Discover more

placeholder_AIOX AI in Your Inbox

The next level of email communication

Discover more

TRUSTED BY MARKET LEADING BRANDS ALL OVER THE WORLD

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Premium user base growth

1&1 uses OX App Suite to increase customer satisfaction and productivity, while growing its premium user base

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Performance improvement

With OX Dovecot Pro and OX productivity tools, Rackspace provides the best possible performance to its customers

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Latest News From Open-Xchange

OX Powers BaseKit's Professional Email For Small...

Partnership delivers complete white-label digital presence offering, extending value for its...

Chris Holder 05/20/26

An Industry Open Letter: Open Source First

As an active member of the European open-source industry, OX collaborates with other companies...

Vittorio Bertola 05/18/26

Introducing DAVx⁵ Select: A seamless new Android...

With OX App Suite, our goal is to ensure your data is always where you need it. Following our...

Wolfgang Rosenauer 04/22/26

ServeTheWorld partners with Open-Xchange to...

Customers ofServeTheWorld, the oldest independent web hosting provider in Norway, now have...

Chris Holder 03/11/26

Latest News From
Open-Xchange

OX Powers BaseKit's Professional Email For Small...

Partnership delivers complete white-label digital presence offering, extending value for its...

Chris Holder 05/20/26

An Industry Open Letter: Open Source First

As an active member of the European open-source industry, OX collaborates with other companies...

Vittorio Bertola 05/18/26

Introducing DAVx⁵ Select: A seamless new Android...

With OX App Suite, our goal is to ensure your data is always where you need it. Following our...

Wolfgang Rosenauer 04/22/26

ServeTheWorld partners with Open-Xchange to...

Customers ofServeTheWorld, the oldest independent web hosting provider in Norway, now have...

Chris Holder 03/11/26

A carrier-grade alternative to Gmail and Outlook, enabling secure, sovereign email, and
productivity apps at any scale — with full control over data, cost, and platform risk.