Select as Accounttype: "CalDAV"

Fill in the informatuon as follows:

• Username: Your groupware e-mail address
• Password:Your groupware-password
• Serveraddress: https://groupware.stepping-stone.ch/

Important (if you user Mac OSX version 10.6):

• Don't enter the tailing slash in the serveraddress, so it must be "https://groupware.stepping-stone.ch".

Click on "Create"