How to Convert Thunderbird Emails to Outlook?

October 11, 2019

Mozilla Thunderbird is an open-source cross-platform email client developed by the Mozilla Foundation. It has some advanced features like quick search folders, message grouping, advanced message filtering, etc. This email client supports add-ons extensions that provide additional functionality. It also offers you many themes to choose from. Thunderbird support IMAP, POP, and LDAP address completion.

Reason Behind Thunderbird to Outlook Conversion

Mozilla Thunderbird and Microsoft Outlook both are amazing email clients. But it is very difficult to choose which one is better. Both email clients have their pros and cons.

Mozilla Thunderbird MS Outlook
Thunderbird is a free email client. To use Outlook as an email client user needs to buy a license key.
Support Windows, MAC, and Unix platform. Support Windows and MAC.
Store all data in the MBOX file format. Use OST and PST files to save data.
Support IMAP, SMTP, POP protocols. Support IMAP, SMTP, POP protocols.
Low security High security
Does not support Exchange server. Support Exchange Server.
Does not support mobile platform. Support Android and Windows mobile.
Does not have a scheduling option. Email scheduling available.

The features of Outlook support large and small organizations and easily fulfill their business needs. It also offers an easy-to-use user interface that provides a great user experience. Thunderbird is a free email client and is used by personal users. That's why many organizations migrating Thunderbird to Outlook. To access MBOX data to Outlook user needs to convert their MBOX files to Outlook PST file format.

How to Migrate Mozilla Thunderbird to Outlook?

In this post, we will discuss the top 2 methods to convert Thunderbird MBOX to Outlook PST format.

  1. Convert Thunderbird to Outlook PST using IMAP
  2. Migrate Thunderbird to Outlook using Third-Party software

Convert Thunderbird to Outlook using IMAP

For this method, you need a Gmail account. If you do not have an account in Gmail, then create a new account. To configure the Gmail account with Thunderbird follow the below-mentioned steps.

Step 1: Enable IMAP Protocol from Gmail

  • Log into Gmail.
  • Click on the Setting icon and select Setting from the list.
  • Select Forwarding and POP/IMAP.
  • Check IMAP is enabled or not, if not enabled it.

Step 2: Connect Thunderbird to Gmail

  • Start Mozilla Thunderbird.
  • Go to Account settings and under the new account option click on the email.
  • Now click on the skip this and use my existing email.
  • Fill Name, Email, and Password on Mail account setup window and click on the Continue button. Make sure to remember password is selected.
  • Thunderbird will automatically detect your server and settings.
  • Click on the Done button.
  • After that Gmail authentication screen will appear. Fill all the details and allow Thunderbird.

Step 3: Import Thunderbird to Gmail

  • Now, go to the Gmail account and create a folder to import emails from Mozilla Thunderbird into Gmail.
  • Go to Thunderbird and select emails which you want to import into Gmail. Ctrl+A if you want to import all emails.
  • Right-Click one of the message and select Copy To > Select Gmail address > Select the folder you want to import.
  • Check your Gmail account and make sure that all data is imported or not.

Step 4: Configure Outlook to Gmail

  • Start Outlook.
  • Go to File and select Account Settings.
  • In the Account Settings dialog box, click on New.
  • Select Email Account and click on the Next.
  • Choose Manual Setup or Additional Server Types and click Next.
  • Select Pop or IMAP and click Next.
  • Fill all the information in Add Account page.
Your name: Enter the name
Email address: Enter Gmail ID
Account type: IMAP
Incoming mail server:
Outgoing mail server (SMTP):
User name: Enter Gmail ID
Password: Your Gmail password
  • Click on the More Settings button.
  • Click on the Outgoing Server tab from Internet email setting screen.
  • Select My outgoing server (SMTP) requires authentication.
  • Select Use same settings as my incoming mail server.
  • Select Advanced tab
Incoming server (IMAP): 993
Use the following type of encrypted connection: SSL
Outgoing server (SMTP): 465
Use the following type of encrypted connection: SSL
  • Click on the OK button.
  • Click on the Next button from the Add Account screen.
  • After the test click close.
  • After the process Download all data from Gmail.

Note: This process is very useful but very time consuming and tough to execute for a non-technical person.

Third-Party Tool to Convert Thunderbird Emails to Outlook

To migrate data from one place to another is very difficult. To make the process easier, you need third-party software. To convert Thunderbird to Outlook I will suggest SysCurve MBOX to PST Converter software. It is one of the best software that easily converts Thunderbird MBOX file to Outlook PST file format and provides a more reliable and secure conversion. You can also try the free demo version of the application, which allows the conversion of the first 20 emails per folder.

  • Download MBOX to PST Converter.
  • Add your MBOX file.
  • The tool will quickly load your data and generate a preview.
  • Click on the Export option and select PST file format.
  • Click on the Export button.
  • After the process, it will convert Thunderbird file to Outlook PST file format.

To access the full features of this product, buy the required licensed copy.


In this post, we discussed how to convert Thunderbird emails to Outlook using the manual method and how you can easily convert Thunderbird to Outlook PST format. If you have questions related to this topic, then use the ask page. we would be happy to help you.