This very brief tutorial will guide you through the steps to set Thunderbird to leave mail on the server. Leaving your mail on the server can be helpful if you use Thunderbird on a portable USB drive to check your email while away from your main computer. That way when you return to your main desktop/laptop, you can still download all of your email.

1. Launch Thunderbird and select Tools from the top menu, then Account Settings… from the drop-down list.

   

2. Select Server Settings from the left window. In the Server Settings section of the right window, place a check in the box labeled Leave messages on server. Click OK.

   
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3. Now when you check your email with Thunderbird, a copy will be left on the server.