Exporting data into a .pst file from Outlook 2010
Export Personal Folders
Select the folder from which the data will be exported and click Next.
Note: Selecting the top level account folder will save all e-mail messages, contacts, calendar information, etc. to the .pst file.
Outlook will prompt for an optional password. Click OK without setting a password, as the additional layer of security may cause issues when importing the .pst into a client or Exchange server.
Outlook will export the .pst to the location set previously. When complete, the file will be available in the specified location. Larger .pst files can take several minutes to process.