After using IMAPSYNC to transfer emails from Scalix to Zimbra (6.0.8), I noticed that all the items in the Sent Folder show the Sender in the "To" column, when looking at the list of emails in the Web interface. If I open the email, the "To" and "From" fields are correct. Also, the "Message Status" column shows "Read" or "Unread", instead of "Sent". If I send an email from the web interface, the "To" field is correct. Only those messages that were imported with IMAPSYNC have this issue.
Curiously, if I look at the same emails in an IMAP client (Thunderbird), everything is correct.