Rated 5 out of 5 stars
I always wanted to see a 'Cc' column in my Inbox and Sent tab and now I have it! Thank you Mic! I prefer to view all messages in their own window (not tab) and thus have only one tab open in TB at any one time. This add-on, together with Axel Grude's QuickFolders add-on are the best things ever to happen for Thunderbird, and make the program truly usable.
Install the Columns Wizard from the 'gear' icon in your Add-ons page--'Install add-on from file'. Then restart TB and, in your extensions page find ColumnsWizard 3.0 and click on the options button. Go to the Custom Columns tab and check the box for 'Cc'. Now you can pick the 'Cc' column as an option in your column picker when you right-click on the column headers in any folder.