hi guys …
I managed it to install the NAS and it is running!
But … some seconds later, the next problem came up … I installed the Employee Portal Front End on another computer (a computer with the Microsoft Office Sharepoint Server 2007 (MOSS2007) on it).
During the installation I was asked for the “Request message queue host” and i entered the name of the computer where Navision is installed, in the textfield “Type in your site URL:” I entered http://localhost
Following I started celebrating because I was quite sure that this MUST work … some seconds later I found out that I can’t add the Employee Portal Service to my MOSS UI … 
because it hasn’t been added to the list of available services.
Any kind of help for me?
Thanks in advance