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How do I change my main e-mail account in Thunderbird?

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I currently switched from a Comcast e-mail account to a g-mail account. Thunderbird is still set up with the Comcast account, and I need to change it to the g-mail account. How do I do that?

I currently switched from a Comcast e-mail account to a g-mail account. Thunderbird is still set up with the Comcast account, and I need to change it to the g-mail account. How do I do that?

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From the Menu Bar select File-New-Existing Mail Account Enter your Gmail info

If your Menu Bar is hidden, and it probably is, press the Alt key to make show.

If you have any messages in the Comcast account you want to keep, move them to folders under Local Folders before deleting the account from Thunderbird.