Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Starting at $6 per mailbox per year
Best Open-Xchange Alternatives ranked by AI · updated May 2025
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Open-Xchange is a cloud-based collaboration software with email, calendar, and file sharing.
Price: Subscription-based pricing
Top 6 Open-Xchange alternatives
Google Workspace is a suite of cloud computing, productivity and collaboration tools, software and products developed by Google.
Starting from $6/user/month
Microsoft 365 is a subscription-based service that provides access to various Microsoft apps and services like Word, Excel, Outlook, Teams, and more.
Starting from $5 per user per month
eGroupWare is an open-source groupware and business collaboration platform for organizations managing email, calendars, contacts, files, projects, and customer data. It supports...
Pros
- Combines groupware, CRM, project management, and document management in one platform
- Self-hosting provides more control than Microsoft 365 or Google Workspace
- Includes business-focused modules beyond basic email and calendars
Cons
- Smaller ecosystem and user community than Nextcloud or Microsoft 365
- Interface is less polished than leading commercial suites
- Hosted pricing and deployment options can be harder to compare
Free (self-hosted); hosted plans vary
Mail-in-a-Box provides a full stack mail server solution with webmail and contacts. It enables easy mail hosting and management.
SOGo is a fully-featured collaboration suite with focus on scalability and simplicity.
Free and paid versions available
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