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Every time I start Thunderbird, I get this error:

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The current operation on 'Trash' did not succeed. The mail server for account spamspam@gmail.com responded: [NONEXISTENT] Unknown Mailbox: Trash (now in authenticated state) (Failure).

I've figured out that it goes away if I create folders in my Gmail accounts called "[Imap]/Trash" and "[Imap]/Sent", but why are these necessary? Even if I tell Thunderbird to unsubscribe from them, it still notices when I remove the labels and starts popping up this error again.

One account also complains if I remove the "Sent Items" label.

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2 Answers 2

In the Account Settings, Copies & Folders you can change the location of any of these, you can even set them to local folders.

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They are already set to IMAP folders like [Gmail]/Sent Mail, but Thunderbird still complains if [Imap]/Sent is deleted. –  endolith Mar 6 '11 at 16:44
    
The closest answer I found is this: forums.mozillazine.org/… I have never had this problem show up even when removing my folders on the mail server next sync of Thunderbird updates them. –  jtreser Mar 18 '11 at 6:35

I finally found the way to make this work

So that the Thunderbird will work and get all data including syb folders Follow these steps :

Browse to : tools > account settings > server settings > advanced button >
UN-check the setting : allow server to override these name spaces (so it would not be checked! by default it is)
Press ok

Browse to : file > subscribe > press : subscribe > ok

You should then get all the folders content + sub folders etc. into your Thunderbird * I have also created a folder in Thunderbird > and checked Google > it synced

Hopefully this will help you Cheers

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