I installed Zimbra on a Red Hat Enterprise machine with no problem and I used imapsync to transfer my existing email. I used a command like this one:

imapsync --nosyncacls --syncinternaldates --host1 server.gtds.lan --user1 yourAccount --passfile1 yourPasswordFile --host2 zimbra.gtds.lan --user2 yourZimbraAccount --passfile2 yourZimbraPasswordFile

and it transferred all my email sucessfully.

However, when I view my email by logging into Zimbra using a web browser, all my email sent or received before May 27, 2005 shows up with a date sent or date received of May 27, 2005. Emails sent after that date have the correct date. May 27, 2005 was the date I set up IMAP on our existing server. But when I view the same emails using Thunderbird, the correct dates show up for email before May 27, 2005.

Is there a way to have these emails show up with the correct dates in the web interface too?