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Citadel is an AJAX-powered groupware platform, and it is a 100% open-source server. Along with IMAP, SMTP, POP3, and GroupDAV its access to its content, it offers a “Web 2.0” interface. IMAP, SMTP, POP3, XMPP, ManageSieve, and Citadel are the server protocols that it implements for the smooth functioning of the server. It is developed to be user-friendly in approach

Software Key Features:



  • Groupware- address book, file storage, and notes.
  • Group scheduling and calendaring.
  • Multiple domain support.
  • Integrated server-side mail filtering and sorting.


Software Suites for?

Small Business, Medium Sized Business, Large Business

Open Source


Is it cloud based?


Technical Support

Knowledge Base

Multi Language Support


Desktop OS Support

Web App, Windows, Macintosh

Mobile Platform

IOS, Android, Windows Mobile, Black Berry

Mobile Support


API Support

Yes - API Available

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