A free email application from Mozilla that's easy to set up and customize

Thunderbird for Mac

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Thunderbird 45.4.0

  -  73.9 MB  -  Open Source
Free Download

Security Status

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of Thunderbird 45.4.0.


For those interested in downloading the most recent release of Thunderbird for Mac or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


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If you have any questions or ideas that you want to share with us - head over to our Contact page and let us know. We value your feedback!

Download Thunderbird 45.4.0

  • Thunderbird 45.4.0 Screenshots

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    Thunderbird 45.4.0 Screenshot 1
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  • Thunderbird 45.4.0 Screenshot 3
  • Thunderbird 45.4.0 Screenshot 4
  • Thunderbird 45.4.0 Screenshot 5

What's new in this version:

- Display name was truncated if no separating space before email address
- Recipient addresses were shown in red despite being inserted from the address book in some circumstances
- Additional spaces were inserted when drafts were edited
- Mail saved as template copied In-Reply-To and References from original email
- Threading broken when editing message draft, due to loss of Message-ID
- "Apply columns to..." did not honor special folders

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