Released in late 2025 with version 135.0.1, Mozilla Thunderbird v135.0.1 (x86) is the latest 32-bit edition of the powerful open-source email client from Mozilla, offering advanced email management, calendar integration, RSS feeds, chat support, and extensive customization through add-ons for secure and efficient communication.
Key Highlights
- Advanced Email Management – Smart folders, message threading, powerful search, tags, and filters for organizing large volumes of email efficiently.
- Calendar & Tasks – Built-in calendar (Lightning) with event/task management, multiple calendar support, and integration with Google Calendar.
- Chat & RSS Support – Integrated chat for XMPP, IRC, Matrix, and Twitter with RSS/Atom feed reader for news and blogs.
- Security & Privacy – OpenPGP encryption support, phishing protection, automatic updates, and Do Not Track options for secure communication.
- Extensive Add-ons – Thousands of extensions and themes available to customize functionality including dark mode, import tools, and advanced filtering.
- Multi-Account Support – Manage unlimited email accounts (IMAP/POP3) with unified inbox, virtual folders, and account color coding.
- Performance & Stability – Optimized rendering engine, improved memory management, enhanced high-DPI support, and full compatibility with Windows 11.
System Requirements
- Windows 11 (or Windows 10 / 8 / 7)
- 4 GB RAM minimum (8 GB+ recommended)
- Integrated GPU sufficient
- NVMe SSD strongly advised