1.Close Outlook 2007
2.Copy the PST file located in
C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Outlook
to a new location, for example : c:\mail.
4.Rename the file in the old location to outlook.old
5.Open Outlook, ignore the warning message.
6.Browse to a specify the location (c:\mail).
6.Delete outlook.old.