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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.

 Kolab 3.3

Free to download

Multiple packages

Various freely distributable licenses

The Kolab-Project and the Kolab-Konsortium


System Requirements

(and many more; best installed via a package manager)

Documentation, Wiki, FAQ, Kolab-users Mailing List, Kolab-announce Mailing List, SyncKolab

Selected Reviews:

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

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Last Updated Sunday, April 26 2015 @ 05:37 AM EDT

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