Recently, Microsoft Outlook displays a message "Unable to open personal folder default", pressing buttons <OK> outlook closes. But if you move the Outlook.pst file when you start outlook can't find a personal folder file, and asks for help. Shows him to move files and outlook works fine, but before the first shutdown. Then, after another run outlook again it can not open the personal folders used by default. Maybe try some pst file reader? Tried to reinstall the office - nothing.