Rated 4 out of 5 stars
This extension makes thunderbird more usefull and more likely to outlook.
There is just an must have feature the project should add: the possibility to turn a task "done" by the alert window. When the alert window opens, the only feature you have is to disable ou postpone the alert. So if you want to turn an task "done" you have to go to tasks tab an select that specific task. It would be very quick to mark tasks as "done" in the alert window