I have mapped a folder on my DNS-321 (FW 1.03 / Raid1) as drive letter 'U' on my laptop (Vista x32) and would like to make these files available offline so I have access to them on my laptop when I am out of the office. Unfortunately I get an error message in Sync center for each file which is attemting to sync: "The process cannot access the file because it is being used by another process". This does not appear to happen using XP. Any ideas?