Adding Mail to Kmail mailboxes

I use Kmail and Suse 10.0. I moved some mail from my old kmailbox to my new kmailbox (/home/.kde/share/apps/kmail/mail/inbox/cur) on another harddrive. But when I open Kmail I only see the mail I've downloaded to this machine, none of the mail I moved. How do I get kmail to recognize the new mail in the mailbox? Is there some default way to add mail to a kmail mailbox? Thanks, Jerome