In order to compact Outlook data files, all you need is deleting items from it. This is the simplest and manual way of compacting Outlook data file. A lot of junk items can be found inside Outlook data files and they can easily be deleted. That would make your Outlook data files handing process smoother and faster. The process of compacting Outlook Customer Service data files can also be done manually. However, estimated time for compacting cannot be ascertained easily. Open the folder, and click on the list view at the bottom of navigation pane. Now, at the navigation pane, you need to right lick on the deleted items, and then click on ‘Empty Folder’ option.