Migrate Thunderbird to Google Workspace with Contacts & Calendars

  

Mark Regan
Published: March 6th, 2026 • 5 Min Read

To migrate Thunderbird to Google Workspace with all the emails, their attributes, and contacts & calendars, there are multiple methods available, like drag & drop for limited folders or an automated migration tool.

Many businesses or organisations upgrade from Mozilla Thunderbird to Google Workspace, as Google Workspace is an all-in-one suite for productivity and enables you access your emails on the go using webmail or a mobile application.

Additionally, restoring mail archives from Thunderbird to Google Workspace provided backup and security, and consolidated complete data in one place.

What Data Can Be Migrated from Thunderbird to Google Workspace?

• Emails
• Contacts
• Calendar
• Attachments
• Local Folder

What Cannot be Directly Transferred from Thunderbird to Google Workspace?

• Account Settings
• Email Filters

Manual Thunderbird to Google Workspace Migration

This is a cost-free approach to migrating Thunderbird to Google Workspace. However it is best suited if you have limited mailboxes in Thunderbird.

Step1: Thunderbird Email Account Setup with Google Workspace

You can securely configure all Google Workspace account Admin/User in all the latest Thunderbird versions using auto-configure & OAuth.

1. Open Thunderbird on Mac/Windows.
2. Click on the Menu option.
3. Select New Account >> Email.
4. Enter your Google Workspace email ID.
5. Thunderbird will autofill server details.
6. Login Thunderbird with Google.
7. Provides all the required access.

Step 2: Move Thunderbird Mailboxes to Google Workspace Account

For Custom Folder:

1. Select all the custom mailboxes under an account.
2. Right-click and choose the Move To option.
3. Select the Google Workspace account as the destination.

Transfer emails from the Inbox, Sent, or Draft folder to Thunderbird:

You cannot move the Default Folders, such as Inbox, Sent, or Draft, in one go. Thus, you have to manually move emails in batches.

1. Open the Thunderbird Mailbox you need to transfer to Google Workspace.
2. Select emails use Ctrl/Shift for bulk selection.
3. Right-click and choose Move To.
4. Select the destination folder in your GWS account.
5. Repeat the process for each email folder.

Learn: How to Import Thunderbird Contacts to a Google Workspace Account?

Limitations of “Drag & Drop” and “Move To” to Migrate Thunderbird to Google Workspace

• Restricted to Thunderbird email to GWS migration.
• Can be time-consuming, manual, and prone to manual errors.
• The folder structure is likely to get lost after importing Thunderbird email in Google Workspace.
• The migration completion depends upon the IMAP sync.

Know More: How to Import MBOX Files into a Google Workspace Account?

How to Migrate Thunderbird to Google Workspace? Steps

1. Install and run the tool on your Windows and Mac desktop.
   
2. Choose Convert Configures Mailbox Data option.
   
3. Select the Thunderbird Mailboxes, Contacts & Address Book to be imported in Google Workspace account.
   
4. Choose G Suite from the saving option.
5. Enter your Google Workspace email ID and connect using OAuth.
6. Press Convert to migrate Thunderbird to Google Workspace.

Advantages of Pro-Tool to Transfer Thunderbird Data to Google Workspace

• Migrate the complete Thunderbird profile to Google Workspace in one go. The tool supports limitless bulk migration.
• Preserves emails, attachments, folder structure, and email metadata like CC, BCC, Time, Date, and more.
• Has advanced filters to selectively move Thunderbird email to Google Workspace based on Date, Time, Subject, and more.
• Easy-to-use software enabling you to skip the manual hassle and errors of account configuration.
• Functional even if Thunderbird crashes, and with local Thunderbird MBOX.
• Fully secure
• This advanced tool is functional with all Thunderbird versions.

Verification Post Thunderbird to Google Workspace Migration