Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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When composing a message or replying to a message it is not possible to type in the body of the email.

Wayne Mery replied
cblaese

Cannot reply to emails or compose a new email because it is not possible to type in the body of the message. Adding an email address or info in the subject line works but cannot type in the body of the message. This problem just started.

Cannot reply to emails or compose a new email because it is not possible to type in the body of the message. Adding an email address or info in the subject line works but cannot type in the body of the message. This problem just started.

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Does starting Thunderbird in safe mode https://support.mozilla.org/en-US/kb/safe-mode-thunderbird solve your problem?