Kopano Core it the continuation of Zarafa ZCP.
KC provides email storage on the server side and brings its own
web-based mail client called WebApp and a desktop client called DeskApp. It provides a full 100% MAPI stack, allowing consistent and reliable storage of communication related data. WebApp has
a similar "look-and-feel" as the Outlook desktop application, yet going beyond of Outlook in terms of features. Personal
address book, calendar, notes and tasks, "Public Folders" and shared
calendar functionalities (inviting internal and external users,
resource management) can be handled by the software as well.