I now got the full information of what is going on:
You have a network drive on your notebook, say:
pointing to some server in the company network.
You can right click on the folder "office" it and tick the menu item
"Immer offline verfügbar" (always available offline).
Then some mechanism creates a shadow copy of that server contents to your notebook.
Now you do not alwayswant to carry around all the data say from 2007-2010.
For that purpose you were able to right click under Windows XP to tick off
the respective folder to exclude it from the syncronisation.
This seems no longer possible under Windows 7.
The optional menu item ("Immer offline verfügbar") always is greyed out.
Any clues how to enable it nonetheless?
(or better said: to get back the Windows XP functionality, that allowed for excluding subdirectories from the synchronisation process?)