Hi Patrick,
I'll be happy to see someone here answering your question, however it may be in your interest for me to point out this forum is mostly dealing with regular end user issues - your question, also considering it's about a company environment, wouldn't really fall among that.
So you may find it worthwhile to consider posting in TechNet or MSDN forums. Also note that people appreciate posts in the language of the forum chosen, in this case German. You are welcome to post in English in the English language communities.
Best regards,
Jorg