you changed what?, where?

I am reading this and thinking you changed your incoming account settings to outgoing account settings so your synchronized mail was lost because the new server information was not the server with your mail on it. But that is just a guess.

Please if you followed instruction perhaps post al ink to them. additionally what screens in Thunderbird did your change? Walk me through the process you followed so I can know where it all went wrong.

I clicked on Thunderbird Beta in the upper left hand of the screen , then account settings, server settings and then server name. I accidentally messed with the server name and it removed all my organized folders. They are in a back up file on my desktop, but not on the email page. They must be there, but I should not have messed with the server information

Who is your email provider?

Please post a screen capture of the server settings as they are now. See How do I create a screenshot of my problem?

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