Zarafa allows you to share mail, calendar and contacts via Outlook or the "Outlook look&feel" webaccess. Zarafa has a native MAPI backend, to have the best Outlook integration. With Zarafa Outlook plugin you can easy set permissions on folders, open shared folders and use the freebusy times. Zarafa can be installed on almost any Linux distribution like Redhat, SuSE, Debian, Ubuntu and Fedora. Via the opensource project Z-Push you can synchronize pda`s and smartphones remote with Zarafa.