windows version of todoist doesnot minimize to the notification area instead of minimizing it to the taskbar.
Thank you for your feedback, we are aware of this issue and we'll address it in the next updates. Sorry for the inconvenience.
We've released a new version of our Windows app in which the minimize/close behavior has been changed. Close will close the app completely and you can configure the behavior of the minimize button the context menu in the system tray icon (you can choose to minimize it to the task bar or the system tray). Please uninstall the old one through the Control Panel -> Add/Remove Programs (or "Programs & Features"), then download and install the new version from http://todoist.com/windows