This article assumes that this is your first time setting up Thunderbird.
If you have already set up Thunderbird with another account or made an attempt, you should do the following to get started: From the main panel, right click Local Folders > Settings > Account Actions > Add Mail Account.
If this is the first time you have set up Thunderbird, then the following panel options appear as documented in this article.
It is up to you if you want Thunderbird to scan any other email programs and automatically pull in messages from those accounts that are set up. If you are not sure, select Skip Integration.
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References: https://knowledge.web.com/subjects/article/KA-01015

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