On Friday 28 September 2012 18:55:27 Timothy Pearson wrote:
> In principle migration should be a matter of:
> 1.) Moving your mailbox from the old ~/.kde3 directory to the new
> ~/.trinity directory
> 2.) Replacing all instances of ".kde3" with ".trinity" in
> ~/.trinity/share/config/kmailrc

that is what I did long time ago, and it worked :)
alternatively, one coud also archive all emails in kde3 (folder->archive 
folder from kmail menu) which will create a tar.bz2 file containing all 
emails.
this file can then be imported from a fresh kmail instance in trinity.

Werner