Import data to .pst file in Outlook 2007
Import Outlook Data File
Import Outlook Data file
If you would like to import all the folders from the .pst file make sure both the top level folder and the include subfolders checkbox is selected. Choose the mailbox you would like the data to go into and click Finish.
Outlook will import the .pst file to the location set previously. Once complete, Outlook will begin to push the restored file(s) to the Exchange server. If Outlook lags during this time, keep Outlook open and use Outlook Web Access until all data has been uploaded to the server.