Download Mozilla Thunderbird 1.5 RC 1

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After two previous beta releases, it’s now time for the first release candidate of Mozilla Thunderbird 1.5. Mozilla Thunderbird is an open source and cross-platform mail and usenet client and includes a junk mail filter, spell checker and the option to further expand the functionality via extensions. This release candidate is only available in English for Windows, Linux and Mac OS X. The release notes for this version are here here are the main changes:

Here’s what’s new in Thunderbird 1.5 RC 1:

  • Automated update to streamline product upgrades. Notification of an update is more prominent, and updates to Thunderbird may now be half a megabyte or smaller. Updating extensions has also improved.
  • Sort address autocomplete results by how often you send e-mail to each recipient.
  • Spell check as you type.
  • Saved Search Folders can now search across multiple accounts.
  • Built in phishing detector to help protect users against email scams.
  • Podcasting and other RSS Improvements.
  • Delete attachments from messages.
  • Integration with server-side spam filtering.
  • Reply and forward actions for message filters.
  • Kerberos Authentication.
  • Auto save as draft for mail composition.
  • message aging.
  • Filters for Global Inbox.
  • Improvements to product usability including redesigned options interface, and SMTP server management.
  • Many security enhancements.

[break]The following downloads are available:
Thunderbird 1.5 RC 1 for Windows
Thunderbird 1.5 RC 1 for Linux
Thunderbird 1.5 RC 1 for Mac OS X[break]

Version number 1.5 RC 1
Operating systems Windows 9x, Windows NT, Windows 2000, Linux, Windows XP, macOS
Website Mozilla Foundation
File size


License type Prerequisites (GNU/BSD/etc.)
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