Windows 7 Tip: 
Auto Zip Attachments is an extension for your Mozilla Thunderbird e-mail client that allows you to easily compress (zip) attachments. A new button named “AutoZip” is added to the compose toolbar. Upon pressing the button all the attachments would be compressed into a single file. Then the attachments are replaced with the zipped file.
This handy little extension packs a lot of functionality. You can choose automatically compress all attachments before sending, manually compress the files with the click of the AutoZip button, add a comment, password protect the zip archive, along with several more time saving features.
If you send many attachments from Thunderbird, this extension could change your life. Auto Zip Attachments is free to download, Windows and Linux only.
Auto Zip Attachments – Thunderbird Add-ons
wow really cool info bro