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Outgoing Server issues with Microsoft Account added to Thunderbird on MAC ... unable to Login Popup, Password issue occurs.

Thunderbird Send and receive email
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Hello, I recently converted a very large OLM (Legacy Outlook on Mac) to Thunderbird on my Macbook. I added an Office365 (work) Account to Thunderbird, and the Outlook Addon App for Thunderbird. I can receive emails to the Office365 account no problem, but cannot Send emails from the Thunderbird (Host) Office365 email, unless I select the Default Outgoing Server which is a different email. I have reset Passwords, related Server settings, and Account Config settings numerous times.

The only other option is to send from the Outlook Addon App ,,, this works fine, But I cannot access the Thunderbird Local Folders from the Outlook Addon.

Any assistance with this issue is truly appreciated. TD

Hello, I recently converted a very large OLM (Legacy Outlook on Mac) to Thunderbird on my Macbook. I added an Office365 (work) Account to Thunderbird, and the Outlook Addon App for Thunderbird. I can receive emails to the Office365 account no problem, but cannot Send emails from the Thunderbird (Host) Office365 email, unless I select the Default Outgoing Server which is a different email. I have reset Passwords, related Server settings, and Account Config settings numerous times. The only other option is to send from the Outlook Addon App ,,, this works fine, But I cannot access the Thunderbird Local Folders from the Outlook Addon. Any assistance with this issue is truly appreciated. TD

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