Rated 3 out of 5 stars

It syncs perfectly with my Google Tasks, but extends the screen behind the Windows taskbar, to where I can't see the controls. So if I edit a task, I can't click "OK" and return to the list.
When I disable the Today Pane, I can then see the full Thunderbird window, including the status bar at the bottom. In another forum, I read that add-ons can cause this to happen. I will search the forums for a solution.