We use Exch2003 Org. I export mailbox by Exmerge to pst file and confirm it can be opened by my Outlook2010 , Win7 environment. But , end user can not open pst file because adding non-Unicode store to profile. I understand Exmerge exported data is ANSI format. 1. so, I wonder why I could open pst file by my Outlook2010 ? 2. And If I import and export pst file to by my Outlook2010 , it will change to Unicode format ? I am asking end user about his environment now.