Because the new Windows mail was driving me crazy, I switched to Thunderbird. I like it a lot better, but now every time a mail comes in it makes a sound. How do I turn the sound of? I do want the pop up, but not the sound.

Options > General tab
Delivery options at the bottom.

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Originally Posted by Curlyben

Options > General tab
Delivery options at the bottom.

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Thank you! I found it:-)!