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 SOGo Alternatives ranked by AI · updated May 2025
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SOGo is a fully-featured collaboration suite with focus on scalability and simplicity.
Price: Free and paid versions available
🎯 sogo.nu
Top 6 SOGo alternatives
Open-Xchange is a cloud-based collaboration software with email, calendar, and file sharing.
Pros
- Cloud-based
- Integration with third-party apps
Cons
- Limited customization
- Higher cost for full feature set
Subscription-based pricing
Kolab Groupware is an open-source collaboration platform with email, calendar, and more.
Pros
- Open-source
- Privacy-focused
Cons
- Steep learning curve
- Less polished user interface
Free and paid versions available
ProtonMail is an end-to-end encrypted email service based in Switzerland.
Free tier available, premium plans starting at $5/month
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
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