dovecot - Nov 2007 - convert plugin

hi....

i have problems with convert plugin, because he delete the message maildir
inbox (i dont know this is't right)...
i set dovecot (Dovecot v1.0.7) to listen with pop and imap protocols...

for example.... if user1 sends to user2 a msg via pop3 or imap, i can see
the msg in user2 imap account, but when i read messages from user2 pop
account, i see the message, but the message was deleted from imap
account....   ?:(?

these are my settings about this issue:

mail_location: maildir:/export/home/vmail/prueba/%n
mail_plugins(imap): quota imap_quota convert
mail_plugins(pop3): quota convert

pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %u

plugin:
  quota: maildir
  convert_mail: mbox:~/mail:INBOX=/export/home/vmail/prueba/%u


maybe i not understand yet wich if this plugin do :(

thanks!!! :)