Thunderbird O365

  1. Does Thunderbird Support Exchange
  2. Thunderbird Exchange Mfa
  3. Thunderbird O365 Calendar
  4. Thunderbird O365 Parts

Does Thunderbird Support Exchange

  • Thunderbird is now part of MZLA Technologies Corporation, a wholly owned subsidiary of Mozilla Foundation. Portions of this content are ©1998–2021 by individual contributors. Portions of this content are ©1998–2021 by individual contributors.
  • Mozilla Thunderbird mail users are migrating to Office 365 for reasons like security, scalability, availability, collaboration, and affordable subscription-based pricing. However, migrating Thunderbird emails to Office 365 or any other email client along with attachments is not an easy task.
  • Many departments on campus will access and manage secondary accounts for departmental messaging and collaboration purposes. While there are multiple methods to manage secondary accounts (i.e. Outlook, Apple Mail, Thunderbird, Mobile Devices, etc.), this page will step through the process to sign into two different O365 accounts on the same computer at the same time through.
O365Topics Map > Client Configuration > Desktop

Moving a Calendar from Mozilla Thunderbird to Office 365 Page 4 of 5 13. The Import and Export Wizard will open, select Import an iCalendar (.ics) or vCalendar files (.vcs) 14. Click the Next button 15. Find and open the file you exported in step 7 16. If you want the imported file to be a part of your default calendar, click the Import button. That means you don't have to use Office365 webmail interface! You can check your emails using other email programs (like Mailbird, Microsoft Outlook or Mozilla Thunderbird). Using desktop email programs will make you more productive and your email will always be available, even offline.

Topics Map > Client Configuration > Mobile
Topics Map > Features and Functionality > Client Capabilities > Desktop
ThunderbirdThunderbird oauth2 o365Topics Map > Features and Functionality > Client Capabilities > Mobile
Topics Map > Features and Functionality > Client Capabilities > Web (OWA)

Most logins to Microsoft Office 365 Exchange require direct authentication to NetID Login. However, some clients/protocols use basic authentication. With basic authentication (also called proxy authentication), the email client transmits the username and password to Office 365, and Office 365 forwards the provided credentials to NetID Login. This article answers general questions about Basic Authentication.

Table of Contents

How does basic authentication work in Office 365?

With basic authentication, your email/calendar client will transmit your username and password to Office 365 (Exchange Online). Office 365 will forward your credentials to the NetID Login Service. The NetID Login Service will verify the credentials and return a token to Office 365. If authentication was successful and the user is authorized, the email/calendar client will be connected to Office 365.

What is modern authentication?

If your email/calendar client uses modern authentication, your credentials are not sent to Office 365 (Exchange Online). Instead, you'll be redirected to the familiar NetID Login screen. If your account is protected by Duo MFA, you will be required to confirm your login. Your client may maintain a connection to Office 365 with an OAuth token, so you may not be required to use NetID Login each time you use the client.

Which clients require basic authentication?


Office 365 does not support modern authentication with IMAP, POP, and SMTP protocols. If you're using an IMAP client like Thunderbird or if you POP your email to Gmail, login is completed via basic authentication. Office 365 allows for either basic or modern authentication with Exchange Web Services (EWS) and Exchange ActiveSync (EAS). Depending on support within your email/calendar client, you may be required to use basic authentication to use EWS or EAS.

Which clients are capable of modern authentication in Office 365?

The following clients are capable of authenticating to Office 365 Exchange Online with modern authentication:

  • Outlook on the web
  • Outlook for Windows (current version)
  • Outlook for Mac (current version)
  • Outlook App for Android
  • Outlook App for iOS version 10.x and greater
  • Mail app on iOS 11.x+
  • Mail app on Mac OS 10.14 (Mojave) and later

How is basic authentication less secure than modern authentication?

Basic authentication in Office 365 is less secure for multiple reasons:

  • If your credentials (NetID username and password) are compromised, they can be used to access your mailbox or to send email from your account. Since basic authentication is not protected by multi-factor authentication, even those enrolled in Duo MFA are at risk.
  • Office 365 basic authentication can be used to verify usernames and passwords via credential stuffing, brute force and password spray attacks. If verified, then the credentials can be used to access other systems/services.

How long will Microsoft support basic authentication in Office 365?

Microsoft has already discontinued support for basic authentication with Outlook REST API. Microsoft has announced an end of support for basic authentication with EWS, EAS, POP, IMAP, Remote PowerShell (RPS) on 10/13/2020. Support for basic authentication with Office 365 SMTP is expected to continue beyond 2020.

Important: Microsoft has decided to delay/suspend the removal of Basic Authentication from Exchange until further notice. Learn more.

To manage this feature, please review the Office 365 - Manage Password Security article.

How can I disable basic authentication to my account?

If you are using Basic authentication to connect to your email account, you may be suspect to any of the following: unauthorized access, use of your NetID credentials for credential stuffing, brute force, and password spray cyberattacks.

To protect your account and NetID credential, it is highly recommended that you make sure Password Security is enabled on your account - to manage this feature, please review the Office 365 - Manage Password Security article.

How can I reconfigure Exchange to use modern authentication on my devices?

To begin using modern authentication through exchange, open a desktop or mobile email client, remove your UW Madison email address, and then re-add your UW Madison email address. When authenticating the account, you should receive a pop up or be redirected to UW Madison's secure login portal, which is the only time you should enter your password.

Information regarding how to configure specific mail clients can be found in:

I'd like to learn more about Office 365 authentication.

If you'd like to learn more about basic and modern authentication in Office 365, please review the following documents:

Thunderbird Exchange Mfa

See Also:

Email migration is quite a challenging task. Different organizations use different strategies to perform Thunderbird to Office 365 migration. Any organization that undertakes it typically needs to export thousands of bulky mailboxes from one platform to another. In addition to the hurdles and risks involved, format incompatibilities between the source and destination platform play a crucial factor. If your organization wishes to export MBOX to office 365, this post is for you.

In this article, we are going to discuss manual methods to migrate MBOX to office 365. But before moving towards on different solutions to import the MBOX file to Office 365 account, let us shortly discuss the major reasons for this migration process.

Why you wish to migrate Thunderbird to Office 365?

Following are some of the reasons for moving from Thunderbird to Microsoft cloud services with O365:

  • Office 365 provides added features of data share, storage, communication, and collaboration.
  • It also added security and data storage benefits with O365 cloud servers.
  • To get unlimited Office applications like Word, Excel, Access, Skype, Exchange server, etc.
  • It provides all the Office suite applications including Exchange online server and Office 365 Mail App at low cost.
  • This enables businesses to import or migrate Thunderbird emails to office 365.

Methods to Migrate Thunderbird Email To Office 365

Following are some of the manual methods for transferring mailbox information to the Microsoft cloud servers with Office 365:

Method 1. Import MBOX Files to Office 365

The manual procedure to migrate Thunderbird MBOX file to Office 365 involves two phases, viz. Save Thunderbird Email to Windows PC and then Import EML to Office 365. Here are the broad steps to cover these phases:

Step 1: Save Thunderbird Email to Windows PC

  • First, create a new folder in Desktop.
  • Next, launch the Thunderbird application on the system.
  • After that, open the message folder where you need to move emails from Thunderbird to MS Outlook are saved.
  • Then, select all the messages using the Ctrl+A key.
  • Now, Right-click on the messages and select Save As option.
  • Finally, Browse to the desktop folder land save the emails there.

Step 2: Import EML to Office 365

  • First, launch the Outlook email application.
  • Now, go to the folder in Outlook where the Thunderbird messages will be saved.
  • Or, select the Folder tab and select the New Folder option.
  • In the Create New folder dialogue box, set a name for the new folder.
  • After that, click on the OK button to migrate Thunderbird email to Office 365.
  • Now, this folder will see on the left panel of the email application.
  • Next, click on the Folder to open its content on the center panel.
  • Finally, drag all the messages from the Desktop folder to this folder in Outlook.

Method 2. Forward As Attachments

Thunderbird O365 Calendar

  • Open the Mozilla Thunderbird on a Windows PC.
  • Then, select the messages that need to be imported from Thunderbird to the O365 account.
  • After that, right-click on them and select Forward as Attachment.
  • You will encounter a new email window in which emails with be added as EML attachments.
  • Next, type in an email ID to migrate MBOX to Office 365.
  • Then, click on the Send button.
  • When the process is finished, view the Thunderbird emails on Office 365 Mail App.

Verify the migrating process by logging into the O365 and opening each email one at a time through a browser in EML format.

Limitations of Migrating Thunderbird Email To Office 365 Manually

  • Limited to Some Emails: The process to transfer Thunderbird emails to Exchange Online is not meant to move the complete email folder containing over 1000 emails. It can only export some important conversations.
  • Lengthy Process: It may take a lot of time in moving each email one at a time to desktop and then to Outlook.
  • Time-Consuming: Forwarding hundreds of Thunderbird messages to Office 365 with large attachment files may take a lot of time.
  • Data Integrity: Often email formatting or SMTP header is changed for some emails during transfer.

Method 3 Professional Approach to migrate MBOX files to Office 365.

The above-mentioned methods to migrate MBOX files to Office 365 would not be suitable for migrating a huge amount of emails, attachments, contacts, etc. So, it is better to rely on professional software that specializes in exporting Thunderbird mailbox data to Office 365. Using a third-party tool can easily overcome all the drawbacks of Manual methods. You can use the MBOX Exporter Utilityto do this migration easily.

Thunderbird O365 Parts


This post describes a long and tedious manual way that is used to migrate multiple mailboxes. It also discusses reasons to make the entire task much easier for administrators. But as you can see manual methods has some drawbacks and also there is a chance of loss of database. So, I recommend you to use a third-party tool to migrate thunderbird to office 365.

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