Is it okay to just copy an entire kmail to a new system?

[Josef Lowder]

.
I've been trying to compare and reconcile 
/home/joe/.kde/share/apps/kmail (and other apps) 
on my new system with the corresponding files from 
my previous system that I have copied onto a spare 
partition on the new system to see if I could perhaps 
safely copy some of those things over. 

Specifically, I am most in need of copying all of my 
previous kmail files to the new system.  Is there any 
risk or inadvisability about doing that? 

This is the syntax that I am considering using: 

# cp -rpf /mnt/hda7/home/joe/.kde/share/apps/kmail /home/joe/.kde/share/apps/