Hi I am having a problem to deliver all mail messages of pst folder in outlook 2003 with exchange server. What i did i backup pst folder from windows 98. Then I create a folder like email and configured outlook 2003 in windows XP. I am tying to deliver new email to this folder i am getting this error message. It never happened to me This is the error message: The Personnel Folder file(.pst) you selected does not match the format of your offline folder file (.ost) To correct this, select a personnel folders file that supports unicode of disable the the use of offline folders