This process will walk you through the process of preparing your historical e-mail and Outlook data for migration to your new Exchange/Outlook profile. It is operated in two steps:
Locate your existing Personal Folder file on your computer
Open Outlook
From the Outlook main menu, click View>Folder List
Right click on the Personal Folders and click Select Properties
Click the Advanced button
The personal folder file path is displayed under the Filename text box.
Record the path and filename for further use.

WARNING!
Your existing Personal Folder file (.PST) should not exceed 2GB.
Should your .PST file exceed 2GB, export to multiple .PST files (each .PST file must be less than 2GB)
To determine the size of your existing .PST file:
Explore your hard drive to the folder path you recorded in Step 6. above.
Click View > Details and observe the file size of your Personal Folder File (.PST)