I have Outlook as part of Office97, just never had the need to use it.
Most of these messages have been on my PC for a long time, I have isolted the ones that will not open into a temp folder in OE, see attached.
I cannot fathom as to why four of the old HTML messages display and 11 do not.
I have trawled through them and the only one that is of concern is the Nero one. I don't seem to have backed that one up or made a note of my registration number

DOH.
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The export to Outlook appears to go ahead fine but when I open Outlook I cannot seem to find them. I did an export of my 'Inbox' and OE address book to Outlook and that worked OK.