I have installed the Open Source version of ZCS and I really like it. However, I am having a little trouble figuring out how to migrate our existing mail. Our setup is pretty standard (and old ). We have a sendmail install and Dovecot .99 IMAP server. Inboxes are stored on the mail server in a spool directory. They are currently in mbox format. Other user created folders reside in the users home directory which is on another server. These are also in mbox format. The problem with the user created folders is that due to webmail and desktop client changes over the years some users have mail in their root directory and other may have it in /home/user/mail. ZCS seems to use the maildir format. (Which I want to convert to anyway for performance reasons) What is the correct process of migrating the user's mail into ZCS keeping in mind that the current mail box format is mbox? I have found some mbox-to-maildir conversion tools. Inboxes will be fairly easy to convert but the user created folders are the ones that I am having trouble figuring out how to convert.