Once you login to web interface, you will be welcomed with a friendly message and a top menu:
"Mail" will open a simple web mail client that can be used to read/write emails:
Clicking on "Calendar" will let you schedule some events. It can be synced with your other devices (e.g. mobile):
"Messages" opens a web XMPP client where you can chat with your friends. Audio/video calls are not supported in web client:
Furthermore, there is a small search form and a tab to change the password.
Administrators have access to one more tab in the menu so that they can manage users:
