I've been working as a home-based Architect/Graphic Designer for 3 years now and I've always used Thunderbird as my main email client as it's proven to be very useful in organizing all the incoming mails I get day-to-day.
Now, a friend introduced me to your website, and honestly, I've come to love it. But sometimes I feel like I want to see it in my email client as well instead of going back and forth my internet browser and Thunderbird since most of my checklist revolves around it. Its a good feature to have which caters to a lot of internet savvy professionals and companies-- which I believe this website is of great help to.
Keep up the good work and cheers!