Article ID: 291645 - View products that this article applies to.
This article was previously published under Q291645
For a Microsoft Outlook 2000 (CW) version of this article, see 196990
For a Microsoft Outlook 98 (IMO) version of this article, see 179870
For a Microsoft Outlook 98 (CW) version of this article, see 179868
This article describes how to compact the personal folders (.pst) files in Microsoft Outlook, to eliminate deleted item space and recover room on your hard disk.
To conserve space on your hard disk, you can delete unwanted items from the various .pst folders, and then compact the files to make them smaller.
NOTE: When you delete the unwanted items from each folder, it 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 CompactionPersonal folders (.pst) files that are not on your computer may require manual compaction because of 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:
How to Manually Start PST Compaction