Citadel is a cloud-based office and productivity suite designed to help businesses of all sizes increase productivity and collaboration. It offers a range of features including document and project management, task and project tracking, real-time collaboration, and file sharing. The suite is designed to be easy to use, secure, and scalable so businesses can get the most out of their data. Additionally, Citadel provides a range of integrations with other popular tools such as Google Calendar, Dropbox, and Slack so users can work seamlessly across multiple platforms.
Discontinued "Last year we published the announcement that Zarafa customers could transition to Kopano. We also announced that Zarafa would not be continued after May 1, 2017. Most ZCP customers have moved to a Kopano subscription now."