I am not going to ask for help here -- not again. I have been trying for a year or longer to find out what is causing Thunderbird to display "Not Responding" message every time I direct it to download new messages. It pops up a dozen or more times during every download session. Usually takes about 15 minutes for Thunderbird to download messages. On the other hand I have Outlook 365 installed which I have to pay annually for and when it opens and I direct it to download the same new email messages, it takes Outlook 365 about 30 seconds to do what Thunderbird is taking 15 minutes to do. I have looked at "every" internet posting on dozens and dozens of different websites about correcting Thunderbird errors. I have un-installed Thunderbird and re-installed. I have uninstalled Firefox browser and tried using Thunderbird while only MS Edge in installed -- still "not responding" issues. Re-installed Firefox and it does not help. Terminated my antivirus programs and tried to use Thunderbird - "Not Responding" still. Change antivirus setting to not ever look at Thunderbird and that makes no difference. Tried uninstalling some other programs to see if it helps. Turned off the automatic "Compound Folders". Nothing ever does help -- get the idea!!! The one thing I have not done is to open in "SAFE MODE" and seeing what happens. I think the Thunderbird support says something like in safe mode to uninstall every program you have one at a time -- reboot in between each uninstall -- then reboot and see if Thunderbird is still "Not Responding". I do not need to go through those long hours of time to try that method as I see from MANY user postings that they have tried that and Thunderbird STILL displays "Not Responding" to them. The Thunderbird splash screen asks for SUPPORT and DONATIONS to help then keep Thunderbird running --but I have donated many times over past years to Thunderbird and Mozilla. I just cannot see sending money in that direction any longer as the "NOT RESPONDING" issue is serious and it is happening to thousands of Thunderbird users and this has been going on for years based on the assorted dates I see on User Postings. This cannot go on for users anymore. I will not bother posting to Thunderbird Forum any longer, nor will I scour the internet for solutions to this problem. I will soon delete my Thunderbird program from all my computers and stick to MS Outlook 365 since it is working flawlessly. I only hope the Thunderbird computer tech people find some way of resolving this OLD issue before everyone is forced to delete Thunderbird and stop all Donations to support. Thunderbird used to be a really GREAT PROGRAM. Maybe taking it out from under Mozilla support was a mistake as things are not going to well anymore. GPTDesign47