I am moving to a new computer on which I installed Windows 11. I downloaded Thunderbird to install so I could move my email. I did that and discovered that my task list isn't here, then remembered that I had installed Lightning. Apparently Lightning has been discontinued and/or integrated into Thunderbird. There appears to be some calender capability, but if I click on Calendar on the home screen, I get a choice of "On My Computer" or "On the network" which I leave at "On My Computer". I click "Next" dialogue box asking for a name, which I enter. When I click on "Create Calendar", I'm returned to the home screen with no apparent way to access this calender, if it exists. If I click File, New, Create Calendar, nothing happens. If I click Edit, Calendar Properties, nothing happens. If I click File, Open Calendar File, it looks for an .ics file in the Mail directory. What I am doing wrong? Thanks, Barb