Thunderbird Not Working with Office 365 – Simple Guide to Fix

While setting up an Office 365 account in Thunderbird using IMAP, the user encounters an issue. The Thunderbird keeps asking for their login credentials. Even after multiple login attempts, the authentication doesn’t succeed. This results in the error “Thunderbird Not Working with Office 365”. In this blog post, we will cover the causes of the issue and provide step-by-step instructions to resolve it.

Reasons: Thunderbird Stopped Working with Office 365

Thunderbird’s failure to connect with Office 365 may stem from different authentication issues. Below, have a look at multiple reasons why this error could have occurred:

• Misconfiguration during Thunderbird setup can lead to Office 365 connection issues.
• If IMAP and SMTP are disabled in your Office 365 account, it can block Thunderbird from syncing emails. 
• Using an incorrect login method in Thunderbird may prevent successful logins.
• Temporary server issues can sometimes affect Thunderbird’s ability to connect.
• Moreover, using an older or outdated version of Thunderbird may not be compatible with modern Office 365 features.

Solutions to Resolve Thunderbird Not Working with Office 365

In the next section, we will discuss various manual methods and a reliable automated method. The manual methods are available and may rectify the issue. But for securely backing up the data, the automated tool is recommended. 

Manual Method 01: Enable IMAP and SMTP in Office 365

Thunderbird uses IMAP and SMTP protocols to send and receive emails through Office 365. If either of these protocols is turned off, Thunderbird will not be able to load the mailbox.

Use the following instructions to enable IMAP and SMTP servers:

1. To start with, sign in to your Office 365 account on a web browser.
2. Now, click on the gear icon, Settings, and select the Mail option.
3. Then, in the Mail settings, navigate to Sync Email.
4. After that, look for IMAP and SMTP.
5. Now, ensure that both IMAP and SMTP are enabled.

Manual Method 02: Configure OAuth2 in Thunderbird

For connecting Thunderbird to Office 365, one needs to configure OAuth2. This ensures secure access, supports MFA, and follows Microsoft’s security policies. 

Below are the steps to start configuring OAuth2 if Thunderbird failed to connect to Office 365:

1. First, open the Thunderbird application.
2. Now, on the top-right corner, click on the Menu button and go to Account Settings.
3. After that, select your Office 365 account and press Server Settings.
4. Now, in the Authentication Method drop-down menu, choose OAuth2.
5. Then, look for the Outgoing Server (SMTP) settings > SMTP Server > Edit.
6. Under Authentication Method, choose OAuth2 and click on Ok.
7. Next, restart Thunderbird.

Manual Method 03: Use Correct Server Settings

Thunderbird needs an accurate mail server configuration to connect properly with Office 365. These settings ensure secure and reliable communication with Microsoft’s servers for sending and receiving emails. 

Check the IMAP and SMTP Server settings:

1. For IMAP:

Server:	Outlook.office 365.com
Port:	993
Encryption:	SSL/TLS
Authentication:	OAuth2

2. For SMTP:

Server:	smtp.office365.com
Port:	587
Encryption:	TLS
Authentication:	OAuth2

A Reliable Software to Fix Thunderbird Not Working with Office 365 Issue

The Cigati Thunderbird Backup Tool is a robust and efficient utility that backs up Thunderbird emails with speed and precision. It is reliable and exports your mailbox data into formats like PST, PDF, and MBOX. Also, during the whole backup and export process, it maintains the original folder hierarchy. Moreover, the tool lets users preview their emails before saving them. With key features like duplicate removal and include or exclude attachments, it offers a flexible backup experience. 

Simplified steps to fix if Thunderbird stopped working with Office 365:

1. First, install the backup tool.
2. Open it and choose the Thunderbird profile that is encountering an error.
3. Now, expand the tree structure and select the files/folders that you want to back up. Then, click Next.
4. Then, choose a desired File Format in which you want to back up your Thunderbird data.
5. Opt for the optional features if you want to customize the result.
6. Click Convert to start the backup process.

Conclusion

To wrap up, there are different manual methods to fix the Thunderbird not working with Office 365 issue. These include checking the IMAP and SMTP settings, configuring OAuth2, and updating server settings. While all of them do help, but can be prone to errors or are not suitable for non-technical users. Moreover, they might work or not depending on the users. Therefore, having a reliable and secure backup of emails using Cigati Thunderbird Backup Tool is recommended. It saves both time and effort while maintaining the integrity and security of the data.

You May Also Read: Thunderbird Not Responding on Windows

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