Both on-premises and hosted Open-Xchange use exactly the same software code.
This is unique in the entire software industry as it provides our customers with unmatched freedom to choose their favorite deployment model any time they like – with no migration effort

Open-Xchange Hosting Edition
Specially designed for web hosts, ISPs, telecommunication companies and IT service providers, who want to offer business E-Mail, file sharing, contact and calendar management as a software-as-a-service solution.

Open-Xchange Server Edition
The ideal solution for mid-size companies, businesses, educational institutions and public administrations that want to run their E-Mail and groupware Server in-house. Choose between Open-Xchange Server Edition, which is ideally suited for integration into existing IT infrastructures, and software appliance Open-Xchange Advanced Server Edition.