Citadel vs Zimbra Collaboration
A side-by-side comparison of Citadel and Zimbra Collaboration — pricing, license, deployment, and where each tool wins.
Citadel
citadel.org
Groupware including email, calendar/scheduling, address books, forums, mailing lists, IM, wiki and blog engines, RSS aggregation and more.
Zimbra Collaboration
zimbra.com
Email, calendar, collaboration server with Web interface and lots of integrations.
| Feature | Citadel | Zimbra Collaboration |
|---|---|---|
| Pricing | Free | Free |
| Model | Open-source | Open-source |
| License | CC-BY-SA-3.0 | CC-BY-SA-3.0 |
| Deployment | Self-hosted | Self-hosted |
| Category | Groupware | Groupware |
| Self-hosted | ✓Yes | ✓Yes |
| Free tier | ✓Yes | ✓Yes |
Pick Citadel if…
- ✓You prefer Citadel's feature set or ecosystem fit.
Pick Zimbra Collaboration if…
- ✓You prefer Zimbra Collaboration's feature set or ecosystem fit.
Switch from Citadel → Zimbra Collaboration
4–16hmedium risk
Plan a sprint — 4-16 engineering hours, run in parallel for a week.
Export from Citadel: CSV, JSON
1 things to watch
- ⚠Manual data review recommended
Switch from Zimbra Collaboration → Citadel
4–20hmedium risk
Plan a sprint — 4-20 engineering hours, run in parallel for a week.
Export from Zimbra Collaboration: CSV, JSON
2 things to watch
- ⚠Manual data review recommended
- ⚠Fewer tutorials online for Citadel — expect more trial-and-error