Nah, copying the file to the CD in NT explorer works fine. Also, reading from the pst in Outlook works ok. The problem just seems to occur when writing to the pst in Outlook. Some times it freezes and other times in seems to not attempt any writing of updates to the pst until you close Outlook. A colleague has got the same setup but he uses several much smaller pst files on the CD (5-15MB each). I think the problem is just the size of the file. Do you agree?.