Import crashed

I have done a fresh install of Ubuntu 13.10, installed kubuntu-desktop and 
tried using KMail to import all my emails. The import crashed with some 
message about 'append' or 'new'. My apologies I have not got the exact 
message, as I was trying to drive Unity (hard to drive), and being used to 
kubuntu, losy the message details. I could attempt the import again  ?

The import was importing from folders, and (I think) crashed because there are 
a number of folders with .../new paths ?  Copying all the ../new paths to 
.../cur within each folder (probably hundreds) will take a while though.

I would like to know how to "start again" with the import. How can I 
completely clear/wipe the database/s ?

The version of KMail is 4.11.5 (going by the .deb). There are problems with 
using kubuntu desktop in 13.10, so I have to use Unity; difficult to navigate. I 
can't run KMail from Unity until I find out how to drop down to shell, or run 
applications.

(I'm running KMail from another computer at present)

Regards,

Peter

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