When I run kmailcvt to import my email from icedove (Debian's Thunderbird), it finishes without errors, but some folders doesn't get imported.

Several hours after kmailcvt has finished, the emails' files in the maildir resource continue to grow, whithout having any clue about when the process is complete.

Reproducible: Always

Steps to Reproduce:
1.Erase the KMail/Akonadi/Nepomuk configuration and data with the following commands:

cd ~
akonadictl stop
find .kde .local .config -name '*kmail*' -exec rm -rf \{\} \;
find .kde .local .config -name '*akonadi*' -exec rm -rf \{\} \;
find .kde .local .config -name '*nepomuk*' -exec rm -rf \{\} \;
rm -rf ~/.local/share/local-mail/

2. Launch kmailcvt and import the Thunderbird emails (10GB more or less). It lasts around 1h, and it ends  without errors.

3. Monitor the maildir repository for new mails. In my case, it is located at ~/.local/share/akonadi_maildir_resource_0. I do a "find . > /tmp/maildir-`date +%Y%m%d%H%M`.txt" there from time to time with these results:

-rw-r--r--  1 jcouto jcouto   556444 Jun  8 17:49 maildir-201306081749.txt
-rw-r--r--  1 jcouto jcouto   556574 Jun  8 17:50 maildir-201306081750.txt
-rw-r--r--  1 jcouto jcouto   557742 Jun  8 17:52 maildir-201306081752.txt
-rw-r--r--  1 jcouto jcouto   560207 Jun  8 18:00 maildir-201306081800.txt
-rw-r--r--  1 jcouto jcouto   561375 Jun  8 18:03 maildir-201306081803.txt
-rw-r--r--  1 jcouto jcouto   565531 Jun  8 18:12 maildir-201306081812.txt
-rw-r--r--  1 jcouto jcouto  8436095 Jun  8 19:44 maildir-201306081944.txt
-rw-r--r--  1 jcouto jcouto  8436095 Jun  8 20:06 maildir-201306082006.txt
-rw-r--r--  1 jcouto jcouto  8436095 Jun  8 20:50 maildir-201306082049.txt
-rw-r--r--  1 jcouto jcouto  8436095 Jun  8 21:51 maildir-201306082151.txt
-rw-r--r--  1 jcouto jcouto  8436095 Jun  9 00:10 maildir-201306090010.txt
-rw-r--r--  1 jcouto jcouto  8436095 Jun  9 10:43 maildir-201306091043.txt

Note that kmailcvt has finished around Jun 8 18:00, while the repository continues growing for several hours.
Actual Results:  
On Jun 9, I miss some folders in the imported email. Besides, Kmail2 is extremely slow when I select any local folder.

Expected Results:  
There should be a way to know when the import process is finished. I'm not sure where my emails is between kmailcvt has ended and they appear in the file system. What would have happened if I had turned off my computer just when kmailcvt had completed?