After Outlook deletes or archives messages, why is the data file still the same size?

After Outlook deletes or archives a message, why the data file remains the same size.

Reason Analysis:

Originally, the archive will still retain the original file structure, need to compress to release this part of the space. Compression is usually run automatically in the background when the computer is idle and Outlook is still running. So you can't see the data file getting smaller immediately.

Solution:

You can manually compress the data files and immediately free up space.

Outlook 2010:

Open "File > Info", click the "Account Setup" button and select "Account Settings".

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Switch to the Data Files tab, select the data file, and then click Settings.

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Click the "Start Compression" button.

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