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NOTE: These procedures only apply if you have installed Outlook with the Internet Mail Only option. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Internet Mail Only option installed, you see "Internet Mail Only".
For information about the differences between Microsoft Outlook and Microsoft Outlook Express e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/257824/EN-US/ )OL2000: Differences Between Outlook and Outlook Express
This article describes how to compact the Personal Folders file(s) (PST) in Microsoft Outlook, to eliminate deleted item space and recover room on your hard disk.
To conserve space on your computer's hard disk, you can delete unwanted items from the various PST folders and then compact the files to make them smaller.
NOTE: Deleting the unwanted items from each folder only moves them to the Deleted Items folder, which is in the same file. You must delete the items from the Deleted Items folder to permanently delete them, so that Outlook can compact the file.
The compacting process does not remove all the free space from the file. It leaves either 16 kilobytes (KB) or 4 percent of the file size (before compacting) whichever is greater.
To be compacted, a file must meet the following requirements:
Automatic Background CompactionPST files that are not on your computer may require manual compaction, due to interactions between the computer where the PST files are stored and your computer.
Automatic compaction takes place as an idle task in the background. The following conditions must be true for this background task to take place:
To Manually Start PST Compaction