Trashcan is a Thunderbird and Lightning extension that adds a Trashcan folder, where you will find all your deleted events, in case you accidentally delete the wrong ones.
Trashcan is an open source add-on designed to work with Mozilla Thunderbird 3.1 and later.
How to Install in Thunderbird:
1. Right-click the link below and choose "Save Link As..." to download and save the file to your hard disk.
2. In Mozilla Thunderbird, open Add-ons from the Tools menu.
3. Click the Install button, and locate/select the file you downloaded and click "OK".
Product's homepage
Requirements:
· Mozilla Thunderbird
· Lightning for Thunderbird