Open-Xchange vs Zimbra
Open-Xchange
For a borderless internet that is open, safe and secure
199 employees · est. 2005 · Koln, Germany
Zimbra
Powering hundreds of millions of mailboxes in 140+ countries!
110 employees · est. 2004 · Buffalo, United States
Zimbra is the older company (2005 vs 2004).
3 signals in the last 90 days
Side-by-Side Comparison
| Metric | Open-Xchange | Zimbra |
|---|---|---|
| Founded | ||
| Founded | 2005 | 2004 older |
| Headquarters | ||
| Headquarters | Koln, Germany | Buffalo, United States |
| Employees | ||
| Employees | 199 | 110 |
| Industry | ||
| Industry | IT, Productivity, Marketing | Analytics, Computing, IT |
| Funding Stage | ||
| Funding Stage | Series D | Venture round |
| Total Funding | ||
| Total Funding | $64.00M | $17.00M |
| Funding Rounds | ||
| Funding Rounds | 5 | 2 |
| Services | ||
| Services | OX App Suite, Dovecot Pro, PowerDNS | Not tracked yet |
| Target Customers | ||
| Target Customers | Service Providers, Public Sector Organizations, Enterprises | Not tracked yet |
| Taxonomy | ||
| Taxonomy | Open Source SoftwareSecure CommunicationOffice Productivity SoftwareIMAP Server SoftwareDNS SolutionsInternet Services +9 | Email PlatformCollaboration SoftwareCloud ServicesCommunication ToolsGlobal PresenceBusiness Solutions +8 |
| Website | ||
| Website | ox.io | zimbra.com |
About Open-Xchange
Open-Xchange is positioned as a market leader in providing secure, open-source communication and productivity software. Founded in 2005, the company has successfully sold over 220 million seats through partnerships with major hosters and telcos like IONOS, Orange, Italiaonline, Comcast, GoDaddy, NTT...
About Zimbra
Zimbra is an email and collaboration platform that powers hundreds of millions of mailboxes in 140+ countries. It offers a range of services including contacts, calendar, tasks, instant messaging, and file sharing, with additional add-ons such as video conferencing, document creation, and file stora...
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Compiled from the BounceWatch company index. We last looked at Open-Xchange on 28 May 2026, and Zimbra on 12 Sep 2024. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.
