Hello there ...
I installed zdesktop beta2 build 1119 on Debian Sid/Lenny and everything went fine during the installation. I am registered with the Zimbra server and zdesktop launched just fine.
After launching, zdesktop does not display any messages from any of the mail folders. The list of folders gets generated but once a folder is clicked nothing shows up in the main window where message would typically appear. Further more, the mailbox size displayed in zdesktop is incorrect in comparison to what is displayed with the typical web client.
As a side note, address book entries show up fine, calendar entries also show up fine. If I use the web client ( via Firefox ), then everything looks good.
I have attached the mailbox.log file to this thread for your review.
I have also attached a screenshot of the Zimbra Desktop client for some visual reference.
Any assistance in the resolution of this problem is appreciated. Please let me know if you need any additional information.