do you have a backup of your old system. usually simply copying over and overwritting the mail directory restore all the mail.
i never use export/import for backup. simply copy and overwright the entire pmail directory. 
<p>do you have a backup of your old system. usually simply copying over and overwritting the mail directory restore all the mail. </p><p>i never use export/import for backup. simply copy and overwright the entire pmail directory. 
</p>