TL;DR:
- Thunderbird, backed by Mozilla, is a free alternative to Outlook that respects your privacy ([Thunderbird Privacy Policy, 2025]).
- Outlook was called out in late 2023 for transmitting user passwords to American servers ([Heise, 2023]).
- Thunderbird protects your credentials through OAuth and a strengthened privacy policy as of early 2025.
- Migrating from Outlook is easy: a built-in tool lets you import your data in just a few clicks ([Malekal, 2023]).
- No ads, no tracking, just a robust and sovereign email client.
Thunderbird: The Quiet Strength of Open Source
The Thunderbird is a symbol of power and protection in the Indigenous traditions of North America. It is no coincidence that Mozilla chose this name for its open-source email client. Today, Thunderbird continues to reinvent itself to offer a modern, secure, and uncompromising experience.
Too often underestimated, Thunderbird is very much alive: it manages emails, contacts, and calendars seamlessly, while allowing advanced customization. Its source code is public, audited, and supported by a dedicated team as well as a large open-source community.
No opaque business models, no ads discreetly inserted into your interface. With Thunderbird, you stay in control.
A Shield Against Data Collection
Thunderbird’s security rests on solid foundations. Thanks to OAuth, you no longer need to store your passwords locally. Sessions are encrypted, and your credentials remain invisible to Mozilla’s servers.
The privacy policy, already rigorous, was revised in February 2025 to meet growing expectations regarding personal data protection. This is a true mark of seriousness in a context where transparency has become essential.
When Outlook Brings the Thunder
In November 2023, German media revealed that the new Outlook client for Windows was sending user account passwords to Microsoft servers based in the United States. This information could then be shared with over 800 partners — a major breach from a privacy standpoint ([Heise, 2023]).
This is not an isolated incident: many proprietary software products collect your data, often without informed consent. The problem is not only technical, it is also legal and ethical.
Switching to Thunderbird, or Leaving the Nest Without Fear
Changing email tools can seem intimidating, but Thunderbird makes the transition easy with a built-in import wizard. You can transfer your emails, contacts, and calendars from Outlook seamlessly.
Here's how:
- Install Thunderbird
- Go to Tools > Import
- Select “Import from Outlook”
- Choose what you want to migrate
- Follow the steps!
In just a few minutes, you get your data back, with no loss and no leaks.
🔵 Blue Fox’s Take
At Blue Fox, we believe in a more ethical, more sovereign, and more user-respectful digital world. Choosing Thunderbird means taking back control of your communications, with a tool that is solid, transparent, and 100% free.
You are not alone: we can support you through this transition, whether for personal or business use. Thunderbird is not just an alternative — it’s a choice you can trust.
đź“š Sources
- Thunderbird Privacy Policy, updated February 12, 2025
- Heise, “New Outlook Shares Your Passwords With Microsoft”, November 2023
- Malekal, “Import Emails, Calendar, Address Book From Outlook to Thunderbird”, November 10, 2023
- Wikipedia, “Thunderbird (mythology)”
- The Canadian Encyclopedia, “Thunderbird”
đź”– Hashtags
#Privacy #Thunderbird #OpenSource #DigitalSecurity #OutlookMigration #DigitalSovereignty #DataProtection