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If you are running CentOS, as I am, then you already have a lot of that. Look in Start -> Office. You will find a personal organizer (korganizer) and address book (kaddressbook), and the system gives each user their own directory in /home for their own files. On LInux client boxes /home can be a remote file system on the server, so all user directories can be centrally managed. If, on the other hand, your client systems are Windows boxes, then you need some other software for private calendaring and address book duties. There are a number of open source tools for that. As for the user's server storage, that is very easy using Samba on the server, and setting up each user with a Linux account, so that their server storage is in the same place that their Linux account files are stored. That's what I do, and it works very well, since that way I have access to all my files, regardless if I am working on my Windows, Mac, or Linux systems.

Sometimes real fast is almost as good as real time. Remember, Google is your friend!