Written by Mozilla Thunderbird is an open-source email client. Below is a list of my favourite add-ons I use:
MinimizeToTray
I use Outlook 2007 at work which allows it to be minimised to a tray iconv, this allows me to use the rest of the tasklbar for my open programs, this addon gives the same functionality to Thunderbird and is always one of the first addons I install after installing Thunderbird.
Download MinimizeToTray (external link)
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