Hi Chaps

First congratulations on a fine product.

I'm currently evaluating Zimbra and am having trouble migrating my Thunderbird mbox email.
I'm simply dragging the folder root from Local Folders to my IMAP account.

Thunderbird happily sets off copying folders and emails which I can see in Zimbra Webmail. The problem is that part way in to the copy (perhaps < 10%) the copy stops. There are no error messages in Thunderbird.

Any ideas?

Is there a debug mode in Thunderbird or a log file in Zimbra that might give a clue?

Is there a more failsafe way to migrate my folders?

Many thanks in anticipation