Hello, I was hoping that my last post would elicit a response from the Tech team, but so far it hasn't. Since we've been back & forth with the Bcc: problem that I'm having with T-BIRD 60, I've asked IF there is a way or a link that I can retro download the last stable version, 52.nnn? When I went to the MOZILLA / THUNDERBIRD website, there is a page which explains the entire history of T-BIRD, and shows the last series of Ver 52.nnn and how issues in each level was addressed. However, when I clicked on Ver 52.9.nnn, the screen changed & prepared me to download Ver. 60.nnn, which IS the version that is causing me all the trouble. I hope someone can send me a link so that I can download a Ver 52.nnn, BUT MORE IMPORTANTLY, keep it at that level, so I don't have to go through this process again. P.S. As I explained previously, T-BIRD 60 is running on this PC in SAFE mode, with NO "Add-ons" attached, and yet the problem still exists. While I have two other PCs (both laptops), these are set up for specific uses, and I do not have ANY e-mail client active on either one. Thank you.