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If your Outlook is out of control, here’s how to compact your PST file according to New Horizons Computer Learning Centers:
After you’ve cleaned out your mailbox, you’d expect that the natural result would be for the file size of your PST file to decrease. Outlook will automatically compact the file if the difference in size will be more than 20 percent. If it’s less, however, you’ll want to manually compact the file. To do so, right-click on the Outlook Today icon in your Folder List or on the Outlook bar and choose Properties. Click the Advanced button, and then click Compact Now in the Personal Folders dialog box. Outlook then compacts your PST file. Click OK twice to close the open dialog boxes.
If you have multiple personal message folders, right-click on their top-level folder, where your account name is displayed. Then, continue with the preceding steps.
