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What happens to e-mail if I de-install Thunderbird?

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When I installed Windows 10, Mozilla Thunderbird seemed to come with it. It has changed my mail look. It has filters. I don't like it. How do I re-install and go back to Outlook?

When I installed Windows 10, Mozilla Thunderbird seemed to come with it. It has changed my mail look. It has filters. I don't like it. How do I re-install and go back to Outlook?

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When I installed Windows 10, Mozilla Thunderbird seemed to come with it.

Thunderbird is not installed as part of Windows 10.

It has changed my mail look.

You'd need to explain that in more detail.