Concerning my latest post on this topic I have to do some update: The current update (Java 7-Update) fixed the issue. I am now able to use the Citizen Card again on my Mac. Great.
… installing Lync on my Mac: Download (here: http://onlinehelp.microsoft.com/en-us/office365-enterprises/hh180727.aspx), Installing (Wow 230 MB [!]), Quick Installation, April Update here: http://www.microsoft.com/de-at/download/details.aspx?id=29571, insert Office 365 credentials, Go! 😉