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Outlook Express automatically compacts messages
With XP Service Pack 2 Microsoft made a number of changes to how Outlook Express compacts your emails.
In Outlook Express the compacting starts after you have opened and closed Outlook Express 100 times. Unfortunately this value cannot be increased or decreased within the software. However, there is a registry hack to reset the counter. I would warn you though that changing the registry can cause severe problems if not done correctly.
To reset it manually:
Alternatively you can install a tool which will compact your mail and reset the counter. Unfortunately I have not tested this tool and cannot offer support on it but to try it then please visit: