Kolab – collaboration software

Kolab is an open source groupware solution. It consists of the Kolab server and a wide variety of Kolab clients, including KDE PIM-Suite Kontact, Horde Webfrontend, Mozilla Thunderbird and Mozilla Lightning with SyncKolab extension and Microsoft Outlook with proprietary Kolab-Connector PlugIns.

Kolab adds intelligent interaction between the components, a web administration interface, management of free-busy lists and more. Major components of the Kolab Server are OpenLDAP, Postfix, Cyrus IMAP, Apache, SASL, and OpenSSL.

It supports mixed client environments (Outlook/KDE) because of an open storage format. Any email client speaking standard protocols can be served.

Kolab2 Server uses the OpenPKG environment to provide a constant base across multiple platforms and distributions.

Features include:

  • Full seamless support of mixed clients environments (Outlook, KDE, Web etc).
  • Support for the K Desktop Environment with Kontact.
  • Support for Microsoft Outlook with proprietary connector PlugIns.
  • A web administration interface.
  • Configuration data is kept in a LDAP directory.
  • A global LDAP adressbook for contacts.
  • IMAP4rev1 as well as POP3 access to mail.
  • Full support for client-side PGP and S/MIME email encryption (officially Sphinx-interoperable).
  • Full support for shared calendars with IMAP ACLs.
  • Full support for shared contacts with IMAP ACLs.
  • Fully offline capable using KDE Kontact or Microsoft Outlook.
  • Support for server side resource management (e.g. rooms, cars).
  • Full support for freebusy handling.
  • Cross-Folder-Search.
  • Birthday Calendar that automatically shows the birthdays of all your contacts from your address book in one neat calendar.
  • Dedicated Out-of-Office settings where you can specify when you are in vacation and which message should be sent under which circumstances.
  • Email tags.
  • Notes.
  • Folder management.

Website: www.kolab.org
Support: Documentation
Developer: The Kolab-Project and the Kolab-Konsortium
License: Various freely distributable licenses


Kolab is written in C++ and PHP. Learn C++ with our recommended free books and free tutorials. Learn PHP with our recommended free books and free tutorials.

Return to Groupware Home Page

Read our complete collection of recommended free and open source software. The collection covers all categories of software.
Share this article

Share your Thoughts

This site uses Akismet to reduce spam. Learn how your comment data is processed.