I use TB ver. 38.1. Since starting to use ver. 38, I've included a calendar inside Thunderbird. First, it was the Mozilla calendar but then I changed it to my Google Calendar. Regardless which I used, Thunderbird now puts two Thunderbird icons in my Windows taskbar. Both do the same thing and I can't figure out how to get rid of one of them. If I close one, both (as well as Thunderbird) close and I can't find anything in Thunderbird's Options to deal with this. And if I try to hide one of the icons, using Windows taskbar customization procedure, both icons get hidden. Any ideas how to get rid of the two identical icons, leaving only one?