1. My emails in storage folders had the correct headers, dates, sender etc but the contents of all emails in some folders (involving several thousand emails) all had the same content, ie not the content relating to the headers.  I sought advice from this website.  I was advised to rebuild my message store which I did but this did not repair the problem.  Having reported back I stopped getting any response from this forum.
2. I took out a subscription to the Microsoft Answers Desk.  They searched for viruses (none), checked that various potentially vulnerable applications had the latest updates (they did), took over desktop operation and looked in my folders but decided it was a corrupt folder and out of their scope.
3. Assuming that was the end of it and the email was lost and my subscription to Windows Answer Desk to be wasted I mentioned it to my brother, a recently retired Senior Software Engineer for the Zurich Stock Exchange.  He had a look a the folder, diagnosed the problem within an hour and wrote a script which fixed my email.
4. The problem is a bug in WLM.
5. Microsoft Answers Desk were unable to deal with this reported bug and said the only means of letting Microsoft know about a Microsoft bug is via this forum.
6. I am uncomfortable publishing a bug on a website in case it's exploitable in the wrong hands.
7. My brother is happy to explain the problem and solution (though having gone to the trouble of diagnosing it he's not inclined to go to some trouble to report a Microsoft problem).
8. Please provide a means by which he can privately explain the issue.