Normal Backup correctly backs up all Outlook Express .dbx files when the
Outlook Express box is checked (which causes all .dbx files to also be
checked).

Subsequently, Differential Backup (with the Outlook Express box checked)
does NOT back up any .dbx files after Outlook Express has modified mail
folders (i.e. the .dbx files).

Differential Backup depends on a file (or folder) being marked by a flag if
any change has occurred since Normal Backup. Is there something different
about Outlook Express files that defeat Differential Backup? Outlook Express
files are not on the excluded files list. Does anyone have a handle on this
problem? Thanks.