I successfully installed Zimbra 4.03 on Ubuntu 6.06.
After installation, I tried to migrate my old mails in Zimbra with IMAP (I used Thunderbird to copy from my old IMAP server to the IMAP server of my Zimbra installation).

With thunderbird (or a webmail as Horde IMP), the "date" of the mail is OK (from my first mail in 1996 to today), but in Zimbra webmail, the "received" column shows only the date of today (the exact date of the copy of the mails on the Zimbra server). I didn't find how to show the real date of the mail.

How to have the date of the mail instead of the date of the copy? I don't want to have a mail from 1996 with the date of today in Zimbra!