Are you tired of dealing with duplicate emails in Thunderbird? Are you frustrated by the slow speed of your mailbox caused by excessive clutter? Duplicate emails are a common issue that can inflate your mailbox and decrease your email client's efficiency. In this guide, we'll uncover the reasons behind Thunderbird duplicate emails and guide you through a step-by-step process to remove duplicate emails from Thunderbird mailbox. Whether you're facing this issue for the first time or have struggled with it in the past, this guide will serve as a handy tool to remove duplicate messages from Thunderbird.