Yes, Yes Yes - problem solved 100% - Many, many thanks for your help!
This (above) is the advice I followed first (I chickened out of trying the previous method over the weekend! Thought I'd 'think about it' first - glad I did, as this method is simpler) and it worked like a charm with no nasty surprises.
Even with the benefit of hindsight I still can't locate any 'Help' in the 'Help File' for Outlook 2003 (hard disk or online) that explains any of this. Amazing...
For anyone who has a similar problem and follows this procedure in Outlook 2003, here is what happens:
- Follow above procedure and select one orphan header, click Shift Delete. Dialogue box opens saying :
Some of the selected headers were downloaded from an E-mail Account that doesn't exist on this computer. These headers might have been downloaded using a different computer, or from an E-mail account that has since been deleted.
To remove all headers associated with this account, click 'Yes'[/INDENT]
To keep these headers, click 'No'
When you click Yes all the orphan headers are immediately deleted (even if you only select one) and the following slightly misleading message appears:
The item could not be deleted. It was either moved or already deleted, or access was denied
However, the orphan headers are history, and now that their presence does not cause an error during every download, Outlook is not prevented (as it was) from sending the signal to the server to delete the recently downloaded messages from the server.
I guess I should forward this thread to Microsoft so they can use it to improve their Help file. Who knows, it might happen...
Once again, many thanks to everyone who responded to my original post, and especially Crazybanana who definitely deserves An Exceptionally Happy and Prosperous New Year!!