Mozilla recently released Thunderbird 17.0.3 with bugs and security fixes.
Mozilla Thunderbird is the default mail client in Xubuntu and just like other Mozilla products, it offers useful addons that you can install.
Right now Mozilla will not be developing new features for Thunderbird but instead they will focus on keeping it secure and stable. You can read about its future in this blog.
You can read full release note here.
- Security fixes here
- Attachments sometimes could not be removed from the composition window using the keyboard [FIXED]