To free up disk space, Outlook Express can compact messages

[Xavier Mustin]

Try resetting the compact count in the registry:

Start the registry editor.
Open this key:

HKEY_CURRENT_USER\Identities\{identity}\Software\Microsoft\Outlook Express\5.0

where identity is a string of letters, numbers, and dashes.
Set the value of Compact Check Count to 0.
Close the registry editor.