Kmail

Hi,
I am a new Kmail user.  I had a couple of general questions and welcome any
help if anyone has time.
 
1.  I have 5+ years of outlook 2010 emails in pst files I would like to
import. I am a beginning Linux user. Is there a genreally accepted way to
import from these .pst files?  I do not need to import anything but emails
that I have recieved and emails that I sent (along with their attachments if
any).   The folder structure in my Outlook is a mess and a result of me
trying to set them the way I want, and microsoft trying to force me to use
them the way they want.  
 
2. The image below ( or attached to this email) shows what I think is called
Kmail's preview window.   Each email takes up two lines, but I am much more
accustomed to it taking up 1 line.  Is there any way to make this one line?
I do not use most features like grouping, threading or anything else, I just
need basic email with the ability to save emails in a searchable archive.
 

 
Thank you

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