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File:Citadel Mail Screen View.jpgFile:Citadel Calendar view showing menu view en.jpg
More screenshots on the project site
Stable release 7.50  (April 14, 2009; Template:Error) [+/−]
Operating system Unix, Linux
Type Groupware
License GPL

Citadel/UX (typically referred to simply as "Citadel") is a collaboration suite (messaging and groupware) that is descended from the Citadel family of programs which became popular in the 1980s and 1990s as a bulletin board system platform. It is designed to run on open source operating systems such as Linux or BSD. Although it is still being used widely[citation needed] on bulletin board systems, in 1998 the developers began to expand its functionality to a general purpose groupware platform.

In order to modernize the Citadel platform for the Internet, the Citadel/UX developers added functionality such as shared calendars, instant messaging, and built-in implementations of Internet protocols such as SMTP, IMAP, Sieve, POP3, and GroupDAV. All protocols offer OpenSSL encryption for additional security.

Users of Citadel/UX systems also have available to them a web-based user interface which employs Ajax style functionality to allow application-like interaction with the system.

Citadel uses the Berkeley DB database for all of its data stores, including the message base.

The software is open source, and released under the GPL license.

External links


ru:Citadel (groupware)

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