SOGo vs Kolab Groupware
A side-by-side comparison of two self-hosted groupware options — licensing, setup difficulty, resource needs, and what each one replaces.
SOGo
Scalable groupware server with webmail, calendar and contacts
VS
Kolab Groupware
Open-source groupware server with mail and calendaring
| Feature | SOGo | Kolab Groupware |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Category | Groupware | Groupware |
| License | GPL-2.0 | AGPL-3.0 |
| Language | Objective-C | PHP |
| Setup difficulty | Hard | Hard |
| Min. RAM | 1,024 MB | 2,048 MB |
| Deployment | docker, bare-metal | bare-metal, docker |
| GitHub stars | ★ 2,165 | ★ 200 |
| First released | 2009 | 2002 |
| Replaces | Microsoft Exchange, Microsoft 365 | Microsoft Exchange, Zimbra |
What are SOGo and Kolab Groupware?
SOGo
SOGo is a fully featured, scalable groupware server offering shared calendars, address books, and webmail. It is fully compatible with Microsoft Outlook via ActiveSync and with CalDAV/CardDAV clients.
- CalDAV and CardDAV support
- Microsoft ActiveSync compatibility
- Shared calendars and contacts
- Integrated AJAX webmail
Kolab Groupware
Kolab is an open-source groupware solution providing email, shared calendars, contacts, tasks, and notes. It integrates standard components like Postfix, Cyrus IMAP, and Roundcube into a coherent collaboration platform.
- Email and calendaring
- Shared address books
- ActiveSync support
- Standards based
SOGo vs Kolab Groupware: key differences
SOGo is written in Objective-C, while Kolab Groupware is built with PHP. Licensing differs — GPL-2.0 for SOGo versus AGPL-3.0 for Kolab Groupware. SOGo is the lighter option, starting around 1,024 MB of RAM against 2,048 MB for Kolab Groupware. Kolab Groupware is the more established project (first released 2002), while SOGo arrived in 2009. SOGo has the considerably larger community, at 2,165 GitHub stars versus 200.
Why pick each one
Choose SOGo if…
- Strong Outlook compatibility
- Scales to many users
Watch out for
- Complex initial setup
- Requires separate mail server
Choose Kolab Groupware if…
- Built on proven components
- Strong standards support
Watch out for
- Complex to install
- Steep operational curve
Frequently asked questions
Is SOGo or Kolab Groupware better?
Neither is universally better. SOGo has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are SOGo and Kolab Groupware free and open-source?
Yes. SOGo is licensed under GPL-2.0 and Kolab Groupware under AGPL-3.0. Both can be self-hosted at no software cost.
Can I run SOGo and Kolab Groupware with Docker?
SOGo: yes. Kolab Groupware: yes.
Which is lighter on resources, SOGo or Kolab Groupware?
SOGo has the smaller minimum footprint at 1,024 MB of RAM, compared to about 2,048 MB for Kolab Groupware. Real-world usage depends on library size, user count, and enabled features.