Hmm... Maybe I should set up a rule that forwards all my emails to a dev unix server as they hit my Inbox...
Anyway, thanks muchly for giving it so much thought. Ultimately, I guess (hope) that it'll be other people trawling through the maze of twisty little .msg files, all alike, rather than myself.
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One further update - I had anotehr look at Outlooks import/export facilities. They are breahtaking in the vast scope of their uselessness - completely failing to include any date-based information at all. It's very clear M$ do all they can to ensure you do not escape from Outlook. Do not pass Go, do not let any other company collect $200...