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I have file a new bug for this: Bug 39605 – Yahoo address book sync error due to unsupported address field element.

Bug 31450 was resolved, but this may be a different issue related to renaming the folder while messages were being synced. Assuming the messages were synced from the Yahoo server to begin with you should still be able to see them in Yahoo's web client. If the messages are still there then you should...

Thanks for the description, I was able to track down the problem. I also filed a bug: Bug 38817 – Google contact sync failure if no contacts exist.

I filed a bug for this: Bug 38384 – Better failure handling for remote folders that cannot be deleted

Can this error be reproduced consistently? Also, could you please follow these instructions in order to produce a debug trace of the IMAP commands leading up to the failure: Yahoo! Zimbra Desktop FAQ - Zimbra :: Wiki

What is the error you receive?

See: Bug 30643 – Optional Support to disable UIDL-Requirement for POP3 Servers
This is targeted to be fixed for ZDesktop 1.1 release.

Freddie,
Unfortunately, the only way to currently do this is by setting GMail up as a generic IMAP account, but then you will lose calendaring and contacts. Please file a bug and we'll look into this.

You should have seen other per-message error reports generated before this one. Could you please attach one of those?

True, since we rotate the logs there may be multiple log files. Would you mind greping the log files to see which one contains the error "Unknown folder"? That would be the one I am interested in.