I am using Windows 10 on a desktop PC. Since the "upgrades" to 102.3.0 and 102.3.1, I spend most of my time in Thunderbird waiting for the '''''Not Responding''''' message to clear. Every time I open or write or delete or move messages: Not Responding. Just opening the program takes several minutes. So I now try to leave it open all day .. unless I forget ... Pop up Task alerts: Last night I should have received 2. Instead there were '''544'''. "Mark Completed" no longer works. I've cleared the cache, cleared recent history, had my PC guy look at my hard drive (no problems found). I've used Thunderbird for many years without any issues with earlier versions. This is beyond frustrating.