Deleting off old emails is not enough to clean out your Microsoft Outlook PST File. Compacting the PST File will help the program running faster and mor efficiently.
Starting with Microsoft Outlook Open:
1. Click on the Tools menu, and choose Options
2. Click on the Mail Setup tab on the box that appears.
3. Click on the Data Files button on the Mail Setup tab
4. Click the Personl Folders
5. Next click th Setting button
6. Click the Compact Now button.