I've installed Zimbra Desktop (not sure on the version, downloaded and installed today) and have synced with my normal Yahoo Mail account (not a premium account or anything, just a normal free one)
I've created some folders in Zimbra and dragged/dropped some of my mails around to tidy them up.
The new folders are showing up in the webmail client, but the messages in them aren't... Have I made a terrible error - I couldn't find any mention of problems in the readme (apart from nested folders and I don't have any of those)
I've RMB'd on the folders and turned sync on if that matters. I've also searched these forums and not found anything useful. The messages that I dragged/dropped are still showing in my Zimbra desktop but have gone from the webmail interface.