[EdLUG] Duplicate folders in kmail

[Alistair]

Having re-installed kubuntu 20.04, installed my list of packages, and restored the 
backed-up files, I restored kontact email etc data using the 'PIM data exporter' 
and I now have duplicate folders in kmail. Received email arrives in two inboxes 
and sent mail is stored in two sent-mail folders.
(Attached is screeshot of part of the kmail folders panel.)
How do I safely delete one set of these? - and how do I confirm which set to 
delete? 

One of the updates to kontact appears to be a counter in the tab on the desktop 
panel. Sometimes this relates to the number of unread mails in the inbox, but at 
others it is an apparently randomly incrementing number.
Does anyone know what this number really represents, and how do I configure it?

Regards,
Alistair
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