Please find your crash-ids at Help > Troubleshooting information and post them here.

I presume you mean Help in TD, which I cannot access, however content of crash report when I try it now is: BuildID: 20250213193602 CrashTime: 1745822679 InstallTime: 1740411934 ModuleSignatureInfo: {"Bitdefender SRL":["gemmauf32.dll","atcuf32.dll","bdhkm32.dll"],"Microsoft Windows":["Windows.UI.Immersive.dll","wscapi.dll","ktmw32.dll","d2d1.dll","InputHost.dll","WindowManagementAPI.dll","Windows.UI.dll","OneCoreUAPCommonProxyStub.dll","Bcp47Langs.dll","MMDevAPI.dll","avrt.dll","dcomp.dll","dataexchange.dll","twinapi.dll","twinapi.appcore.dll","ondemandconnroutehelper.dll","WinTypes.dll","CoreMessaging.dll","CoreUIComponents.dll","TextInputFramework.dll","AudioSes.dll","mscms.dll","dxgi.dll","d3d11.dll","urlmon.dll","DWrite.dll","BCP47mrm.dll","iertutil.dll","ColorAdapterClient.dll","usp10.dll","dwmapi.dll","uxtheme.dll","winrnr.dll","nlaapi.dll","wshbth.dll","pnrpnsp.dll","NapiNSP.dll","winnsi.dll","dhcpcsvc.dll","dhcpcsvc6.DLL","FWPUCLNT.DLL","rasadhlp.dll","dnsapi.dll","devobj.dll","sspicli.dll","npmproxy.dll","netprofm.dll","winsta.dll","srvcli.dll","ntmarta.dll","powrprof.dll","winhttp.dll","propsys.dll","profapi.dll","wldp.dll","windows.storage.dll","netutils.dll","wsock32.dll","kernel.appcore.dll","msasn1.dll","umpdc.dll","wtsapi32.dll","dbgcore.dll","mswsock.dll","userenv.dll","dbghelp.dll","version.dll","wininet.dll","IPHLPAPI.DLL","CRYPTBASE.DLL","winmm.dll","ucrtbase.dll","bcryptPrimitives.dll","msctf.dll","win32u.dll","rpcrt4.dll","setupapi.dll","user32.dll","clbcatq.dll","ole32.dll","cfgmgr32.dll","msvcrt.dll","SHCore.dll","bcrypt.dll","gdi32full.dll","advapi32.dll","crypt32.dll","KERNELBASE.dll","oleaut32.dll","kernel32.dll","msvcp_win.dll","wintrust.dll","nsi.dll","ws2_32.dll","shell32.dll","combase.dll","gdi32.dll","sechost.dll","shlwapi.dll","imm32.dll","psapi.dll","ntdll.dll","BitsProxy.dll","directmanipulation.dll","Windows.Globalization.dll","explorerframe.dll","KBDUK.DLL","resourcepolicyclient.dll"],"Microsoft Windows Software Compatibility Publisher":["msvcp140.dll","VCRUNTIME140.dll"],"Mozilla Corporation":["thunderbird.exe","xul.dll","nssckbi.dll","freebl3.dll","softokn3.dll","lgpllibs.dll","nss3.dll","mozglue.dll","gkcodecs.dll","rnp.dll"]} ProductID: {3550f703-e582-4d05-9a08-453d09bdfdc6} ProductName: Thunderbird ReleaseChannel: esr StartupTime: 1745822673 SubmittedFrom: Client Throttleable: 1 UptimeTS: 6.0 Vendor: Version: 128.7.1 WindowsErrorReporting: 1 This report also contains technical information about the state of the application when it crashed.

Sorry, I failed to notice your crash is on startup. See instructions at https://support.mozilla.org/en-US/kb/mozilla-crash-reporter-tb#w_viewing-reports-outside-of-thunderbird

Thanks Wayne, I have 14 pending reports starting on 22/1/25 and 55 submitted reports starting on 15/1/25 apart from a stray one on 06/10/23.

First submitted is Crash ID: ⁨bp-810da138-8a7e-4c06-a44a-ef0220250115⁩ dated 15/1/25 most recent submitted is Crash ID: ⁨bp-19680047-3665-4609-b465-110360250427⁩ dated 27/4/25 I expect some of the earliest crashes were those which were not terminal instantly and allowed me to view the application for a while. Would you like a few more or even all of them? My expectation is that I exceeded number of allowed stored messages, but am unable to reduce them once it began crashing at start up.

This crash is caused by bitdefender https://bugzilla.mozilla.org/show_bug.cgi?id=1940810

Download and install the latest version from https://www.thunderbird.net/download/

Let us know whether the crashing stops. If the crashing does not stop, you will need to update bitdefender or make some other adjustment.

Hi Wayne, Many thanks for your help. Upgrading TB to 137.0.2 64bit was straight forward and I now have access to 25.5k emails. I was expecting/hoping that my 12 accounts would transfer, but I was only left with my original address from decades ago. Still not difficult to add the rest - I had plenty of practice trying out alternative apps when TB failed on me. I am not sure that a unified inbox will be easy, TB ver 137.0.2 seems to have a few peculiarities and finding my way around the menus will take a bit of time. I have my grandaughter's laptop to save as well, it also had crashed and also had the house bitdefender installed. On the otherhand my daughter's was still working. I suppose she had not bothered with bitdefender on her own pc. Cheers David