Vista-Ultimate, Offline files not working (NAS)

I have a notebook with Vista-Ultimate on it.
I have a Intel SS4000-E NAS unit in my network on wich all of my data
resides.I have marked several files/folders for 'allways available offline'
but when I'm offline I can't open the files (Error: 0x800710FE: This file is
currently not available for use on this computer). Syncing also gives an
error for each and every file in the Sync-Center 'The process cannot access
the file because it is being used by another process' while I'm the only
user on the system at this time and it's NOT in use.

I've read that offline files may not work correctly with NAS units, I've
also seen some postings about making changes to the 'samba' software ?? But
I don't know how to do that or if the SS4000 even uses Samba...

I'm not sure how to proceed, but I really, really, really need my offline
files


Can someone please help me ?

TIA,
Jurjen.