Thunderbird Community Forum

Hello -- I'm hoping someone will be able to help!

I'm running Thunderbird 140.9.1esr (32-bit) on Windows 10 Pro version 22H2 (OS Build 19045.6466) with an Intel Core i7 processor.

Thunderbird suddenly started crashing repeatedly since yesterday. It ran long enough for me to install version 140.9.1esr, but still crashes repeatedly within a couple minutes of running the application, even if I don't do anything such as trying to reply to a message.

Please see below what I get in the Windows Event Viewer, pretty much the same for each crash. I have also pasted the contents of the following file (the others mentioned above don't exist).

C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppHang_thunderbird.exe_5d8d3f9d863d0b28eacbd2a393cdc3d04ef559_c250478b_deffcb88-26f8-4204-bffd-7e6fd5a2ea88

I've gone to Troubleshooting Information, I've "cleared startup cache", I've tired "Troubleshoot Mode" and still Thunderbird crashes. There's nothing in Crash Reports.

Any help would be truly appreciated!

Best regards,

Miles Montelius

==========

The program thunderbird.exe version 140.9.1.0 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Security and Maintenance control panel.

Process ID: 2fe4
Start Time: 01dcc9b06a74fe27
Termination Time: 19
Application Path: C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe
Report Id: 1f27bed4-950e-4cf2-b2be-0e17b3c5bff0
Faulting package full name: 
Faulting package-relative application ID: 
Hang type: Unknown

===========

Fault bucket 2206417569010378635, type 5 Event Name: AppHangB1 Response: Not available Cab Id: 0

Problem signature: P1: thunderbird.exe P2: 140.9.1.0 P3: 69d0a82a P4: aa1e P5: 134217728 P6: P7: P8: P9: P10:

Attached files: \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER1ECA.tmp.WERInternalMetadata.xml \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER1EDB.tmp.xml \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER1EE9.tmp.csv \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER1F19.tmp.txt \\?\C:\Users\Miles\AppData\Local\Temp\WER2554.tmp.appcompat.txt

These files may be available here: \\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppHang_thunderbird.exe_5d8d3f9d863d0b28eacbd2a393cdc3d04ef559_c250478b_deffcb88-26f8-4204-bffd-7e6fd5a2ea88

Analysis symbol: Rechecking for solution: 0 Report Id: 1f27bed4-950e-4cf2-b2be-0e17b3c5bff0 Report Status: 268435456 Hashed bucket: 6bb25f0f2ae99d39de9ec516c30b678b Cab Guid: 0

================================= Report.wer

Version=1 EventType=AppHangB1 EventTime=134203853995104936 ReportType=3 Consent=1 UploadTime=134203854012764044 ReportStatus=268435456 ReportIdentifier=deffcb88-26f8-4204-bffd-7e6fd5a2ea88 IntegratorReportIdentifier=1f27bed4-950e-4cf2-b2be-0e17b3c5bff0 Wow64Host=34404 Wow64Guest=332 NsAppName=thunderbird.exe OriginalFilename=thunderbird.exe AppSessionGuid=00002fe4-0001-0089-27fe-746ab0c9dc01 TargetAppId=W:00069140475b22fa6eb7e8a09288ccaa9eed00000000!0000296d4ceec558ce2477919ca1d55d16c4eb0ece48!thunderbird.exe TargetAppVer=2026//04//04:05:56:58!6df25!thunderbird.exe BootId=4294967295 TargetAsId=1039 IsFatal=1 EtwNonCollectReason=1 Response.BucketId=6bb25f0f2ae99d39de9ec516c30b678b Response.BucketTable=5 Response.LegacyBucketId=2206417569010378635 Response.type=4 Sig[0].Name=Application Name Sig[0].Value=thunderbird.exe Sig[1].Name=Application Version Sig[1].Value=140.9.1.0 Sig[2].Name=Application Timestamp Sig[2].Value=69d0a82a Sig[3].Name=Hang Signature Sig[3].Value=aa1e Sig[4].Name=Hang Type Sig[4].Value=134217728 DynamicSig[1].Name=OS Version DynamicSig[1].Value=10.0.19045.2.0.0.256.48 DynamicSig[2].Name=Locale ID DynamicSig[2].Value=2057 DynamicSig[22].Name=Additional Hang Signature 1 DynamicSig[22].Value=aa1ee6b70f5730e6b2c3407f0286853a DynamicSig[23].Name=Additional Hang Signature 2 DynamicSig[23].Value=d531 DynamicSig[24].Name=Additional Hang Signature 3 DynamicSig[24].Value=d5313f546285bab3fbd31e098595851c DynamicSig[25].Name=Additional Hang Signature 4 DynamicSig[25].Value=aa1e DynamicSig[26].Name=Additional Hang Signature 5 DynamicSig[26].Value=aa1ee6b70f5730e6b2c3407f0286853a DynamicSig[27].Name=Additional Hang Signature 6 DynamicSig[27].Value=d531 DynamicSig[28].Name=Additional Hang Signature 7 DynamicSig[28].Value=d5313f546285bab3fbd31e098595851c UI[3]=Thunderbird is not responding UI[4]=If you close the program, you might lose information. UI[5]=Close the program UI[6]=Close the program UI[7]=Close the program LoadedModule[0]=C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe LoadedModule[1]=C:\WINDOWS\SYSTEM32\ntdll.dll LoadedModule[2]=C:\WINDOWS\System32\KERNEL32.DLL LoadedModule[3]=C:\WINDOWS\System32\KERNELBASE.dll LoadedModule[4]=C:\WINDOWS\System32\USP10.dll LoadedModule[5]=C:\WINDOWS\System32\ADVAPI32.dll LoadedModule[6]=C:\Program Files (x86)\Mozilla Thunderbird\mozglue.dll LoadedModule[7]=C:\WINDOWS\System32\msvcrt.dll LoadedModule[8]=C:\WINDOWS\System32\sechost.dll LoadedModule[9]=C:\WINDOWS\System32\RPCRT4.dll LoadedModule[10]=C:\WINDOWS\System32\bcrypt.dll LoadedModule[11]=C:\WINDOWS\System32\ucrtbase.dll LoadedModule[12]=C:\Program Files (x86)\Mozilla Thunderbird\VCRUNTIME140.dll LoadedModule[13]=C:\WINDOWS\System32\CRYPT32.dll LoadedModule[14]=C:\Program Files (x86)\Mozilla Thunderbird\MSVCP140.dll LoadedModule[15]=C:\WINDOWS\System32\GDI32.DLL LoadedModule[16]=C:\WINDOWS\SYSTEM32\CRYPTBASE.dll LoadedModule[17]=C:\WINDOWS\System32\win32u.dll LoadedModule[18]=C:\WINDOWS\System32\gdi32full.dll LoadedModule[19]=C:\WINDOWS\System32\msvcp_win.dll LoadedModule[20]=C:\WINDOWS\System32\USER32.dll LoadedModule[21]=C:\WINDOWS\System32\IMM32.DLL LoadedModule[22]=C:\WINDOWS\System32\bcryptPrimitives.dll LoadedModule[23]=C:\Program Files (x86)\Mozilla Thunderbird\nss3.dll LoadedModule[24]=C:\WINDOWS\SYSTEM32\WSOCK32.dll LoadedModule[25]=C:\WINDOWS\System32\WS2_32.dll LoadedModule[26]=C:\Program Files (x86)\Mozilla Thunderbird\gkcodecs.dll LoadedModule[27]=C:\Program Files (x86)\Mozilla Thunderbird\lgpllibs.dll LoadedModule[28]=C:\Program Files (x86)\Mozilla Thunderbird\xul.dll LoadedModule[29]=C:\WINDOWS\System32\shcore.dll LoadedModule[30]=C:\WINDOWS\System32\combase.dll LoadedModule[31]=C:\WINDOWS\System32\WINTRUST.dll LoadedModule[32]=C:\WINDOWS\SYSTEM32\ktmw32.dll LoadedModule[33]=C:\WINDOWS\SYSTEM32\VERSION.dll LoadedModule[34]=C:\WINDOWS\SYSTEM32\PROPSYS.dll LoadedModule[35]=C:\WINDOWS\SYSTEM32\ncrypt.dll LoadedModule[36]=C:\WINDOWS\System32\MSASN1.dll LoadedModule[37]=C:\WINDOWS\SYSTEM32\NTASN1.dll LoadedModule[38]=C:\WINDOWS\SYSTEM32\ntmarta.dll LoadedModule[39]=C:\WINDOWS\SYSTEM32\kernel.appcore.dll LoadedModule[40]=C:\WINDOWS\system32\uxtheme.dll LoadedModule[41]=C:\WINDOWS\System32\OLEAUT32.dll LoadedModule[42]=C:\WINDOWS\System32\psapi.dll LoadedModule[43]=C:\WINDOWS\SYSTEM32\dwrite.dll LoadedModule[44]=C:\WINDOWS\SYSTEM32\dbghelp.dll LoadedModule[45]=C:\WINDOWS\SYSTEM32\dbgcore.DLL LoadedModule[46]=C:\WINDOWS\System32\SHELL32.dll LoadedModule[47]=C:\WINDOWS\System32\windows.storage.dll LoadedModule[48]=C:\WINDOWS\System32\Wldp.dll LoadedModule[49]=C:\WINDOWS\System32\shlwapi.dll LoadedModule[50]=C:\WINDOWS\System32\ole32.dll LoadedModule[51]=C:\WINDOWS\SYSTEM32\profapi.dll LoadedModule[52]=C:\WINDOWS\SYSTEM32\WINMM.dll LoadedModule[53]=C:\WINDOWS\System32\clbcatq.dll LoadedModule[54]=C:\WINDOWS\system32\napinsp.dll LoadedModule[55]=C:\WINDOWS\system32\pnrpnsp.dll LoadedModule[56]=C:\Windows\System32\Windows.UI.dll LoadedModule[57]=C:\Windows\System32\WindowManagementAPI.dll LoadedModule[58]=C:\Windows\System32\InputHost.dll LoadedModule[59]=C:\Windows\System32\TextInputFramework.dll LoadedModule[60]=C:\WINDOWS\SYSTEM32\wintypes.dll LoadedModule[61]=C:\WINDOWS\SYSTEM32\twinapi.appcore.dll LoadedModule[62]=C:\Windows\System32\CoreMessaging.dll LoadedModule[63]=C:\Windows\System32\CoreUIComponents.dll LoadedModule[64]=C:\WINDOWS\system32\wshbth.dll LoadedModule[65]=C:\WINDOWS\System32\netprofm.dll LoadedModule[66]=C:\WINDOWS\system32\NLAapi.dll LoadedModule[67]=C:\WINDOWS\SYSTEM32\IPHLPAPI.DLL LoadedModule[68]=C:\WINDOWS\System32\mswsock.dll LoadedModule[69]=C:\WINDOWS\SYSTEM32\DNSAPI.dll LoadedModule[70]=C:\WINDOWS\System32\NSI.dll LoadedModule[71]=C:\WINDOWS\System32\winrnr.dll LoadedModule[72]=C:\Windows\System32\Windows.UI.Immersive.dll LoadedModule[73]=C:\WINDOWS\System32\npmproxy.dll LoadedModule[74]=C:\WINDOWS\SYSTEM32\WINNSI.DLL LoadedModule[75]=C:\WINDOWS\SYSTEM32\dhcpcsvc6.DLL LoadedModule[76]=C:\WINDOWS\SYSTEM32\dhcpcsvc.DLL LoadedModule[77]=C:\Program Files (x86)\Mozilla Thunderbird\softokn3.dll LoadedModule[78]=C:\Program Files (x86)\Mozilla Thunderbird\freebl3.dll LoadedModule[79]=C:\WINDOWS\System32\MSCTF.dll LoadedModule[80]=C:\WINDOWS\System32\MMDevApi.dll LoadedModule[81]=C:\WINDOWS\System32\DEVOBJ.dll LoadedModule[82]=C:\WINDOWS\System32\cfgmgr32.dll LoadedModule[83]=C:\WINDOWS\SYSTEM32\AUDIOSES.DLL LoadedModule[84]=C:\WINDOWS\SYSTEM32\powrprof.dll LoadedModule[85]=C:\WINDOWS\SYSTEM32\UMPDC.dll LoadedModule[86]=C:\WINDOWS\System32\SETUPAPI.dll LoadedModule[87]=C:\Windows\System32\wscapi.dll LoadedModule[88]=C:\WINDOWS\System32\urlmon.dll LoadedModule[89]=C:\WINDOWS\System32\iertutil.dll LoadedModule[90]=C:\WINDOWS\System32\srvcli.dll LoadedModule[91]=C:\WINDOWS\System32\netutils.dll LoadedModule[92]=C:\Windows\System32\Windows.Globalization.dll LoadedModule[93]=C:\Windows\System32\bcp47mrm.dll LoadedModule[94]=C:\Windows\System32\Bcp47Langs.dll LoadedModule[95]=C:\WINDOWS\SYSTEM32\dxgi.dll LoadedModule[96]=C:\WINDOWS\SYSTEM32\dwmapi.dll LoadedModule[97]=C:\WINDOWS\SYSTEM32\dcomp.dll LoadedModule[98]=C:\WINDOWS\SYSTEM32\mscms.dll LoadedModule[99]=C:\WINDOWS\SYSTEM32\ColorAdapterClient.dll LoadedModule[100]=C:\WINDOWS\SYSTEM32\USERENV.dll LoadedModule[101]=C:\WINDOWS\system32\twinapi.dll LoadedModule[102]=C:\WINDOWS\SYSTEM32\WTSAPI32.dll LoadedModule[103]=C:\WINDOWS\SYSTEM32\WINSTA.dll LoadedModule[104]=C:\WINDOWS\system32\directmanipulation.dll LoadedModule[105]=C:\WINDOWS\SYSTEM32\d2d1.dll LoadedModule[106]=C:\WINDOWS\SYSTEM32\XmlLite.dll LoadedModule[107]=C:\WINDOWS\system32\dataexchange.dll LoadedModule[108]=C:\WINDOWS\system32\d3d11.dll LoadedModule[109]=C:\WINDOWS\system32\explorerframe.dll LoadedModule[110]=C:\Windows\System32\OneCoreUAPCommonProxyStub.dll LoadedModule[111]=C:\Program Files (x86)\Mozilla Thunderbird\rnp.dll LoadedModule[112]=C:\WINDOWS\System32\WININET.dll LoadedModule[113]=C:\WINDOWS\SYSTEM32\SspiCli.dll LoadedModule[114]=C:\WINDOWS\SYSTEM32\ondemandconnroutehelper.dll LoadedModule[115]=C:\WINDOWS\SYSTEM32\winhttp.dll LoadedModule[116]=C:\Windows\System32\rasadhlp.dll LoadedModule[117]=C:\WINDOWS\System32\fwpuclnt.dll LoadedModule[118]=C:\WINDOWS\SYSTEM32\avrt.dll LoadedModule[119]=C:\Windows\System32\Windows.Security.Integrity.dll LoadedModule[120]=C:\WINDOWS\SYSTEM32\LINKINFO.dll LoadedModule[121]=C:\Windows\System32\OneCoreCommonProxyStub.dll LoadedModule[122]=C:\WINDOWS\SYSTEM32\ntshrui.dll LoadedModule[123]=C:\WINDOWS\SYSTEM32\cscapi.dll LoadedModule[124]=C:\WINDOWS\SYSTEM32\policymanager.dll LoadedModule[125]=C:\WINDOWS\SYSTEM32\msvcp110_win.dll LoadedModule[126]=C:\WINDOWS\SYSTEM32\d3dcompiler_47.dll LoadedModule[127]=C:\WINDOWS\SYSTEM32\CRYPTSP.dll LoadedModule[128]=C:\Program Files (x86)\Mozilla Thunderbird\libGLESv2.dll LoadedModule[129]=C:\WINDOWS\SYSTEM32\d3d9.dll LoadedModule[130]=C:\Program Files (x86)\Mozilla Thunderbird\libEGL.dll LoadedModule[131]=C:\WINDOWS\SYSTEM32\cryptnet.dll LoadedModule[132]=C:\WINDOWS\SYSTEM32\drvstore.dll LoadedModule[133]=C:\WINDOWS\System32\imagehlp.dll LoadedModule[134]=C:\WINDOWS\system32\rsaenh.dll LoadedModule[135]=C:\WINDOWS\SYSTEM32\dxcore.dll LoadedModule[136]=C:\WINDOWS\SYSTEM32\resourcepolicyclient.dll State[0].Key=Transport.DoneStage1 State[0].Value=1 OsInfo[0].Key=vermaj OsInfo[0].Value=10 OsInfo[1].Key=vermin OsInfo[1].Value=0 OsInfo[2].Key=verbld OsInfo[2].Value=19045 OsInfo[3].Key=ubr OsInfo[3].Value=6466 OsInfo[4].Key=versp OsInfo[4].Value=0 OsInfo[5].Key=arch OsInfo[5].Value=9 OsInfo[6].Key=lcid OsInfo[6].Value=2057 OsInfo[7].Key=geoid OsInfo[7].Value=242 OsInfo[8].Key=sku OsInfo[8].Value=48 OsInfo[9].Key=domain OsInfo[9].Value=0 OsInfo[10].Key=prodsuite OsInfo[10].Value=256 OsInfo[11].Key=ntprodtype OsInfo[11].Value=1 OsInfo[12].Key=platid OsInfo[12].Value=10 OsInfo[13].Key=sr OsInfo[13].Value=0 OsInfo[14].Key=tmsi OsInfo[14].Value=223670134 OsInfo[15].Key=osinsty OsInfo[15].Value=1 OsInfo[16].Key=iever OsInfo[16].Value=11.3636.19041.0-11.0.1000 OsInfo[17].Key=portos OsInfo[17].Value=0 OsInfo[18].Key=ram OsInfo[18].Value=8174 OsInfo[19].Key=svolsz OsInfo[19].Value=231 OsInfo[20].Key=wimbt OsInfo[20].Value=0 OsInfo[21].Key=blddt OsInfo[21].Value=191206 OsInfo[22].Key=bldtm OsInfo[22].Value=1406 OsInfo[23].Key=bldbrch OsInfo[23].Value=vb_release OsInfo[24].Key=bldchk OsInfo[24].Value=0 OsInfo[25].Key=wpvermaj OsInfo[25].Value=0 OsInfo[26].Key=wpvermin OsInfo[26].Value=0 OsInfo[27].Key=wpbuildmaj OsInfo[27].Value=0 OsInfo[28].Key=wpbuildmin OsInfo[28].Value=0 OsInfo[29].Key=osver OsInfo[29].Value=10.0.19041.6466.amd64fre.vb_release.191206-1406 OsInfo[30].Key=buildflightid OsInfo[30].Value=1a6da8dc-e1ef-4c46-89e4-4a56762ca494 OsInfo[31].Key=edition OsInfo[31].Value=Professional OsInfo[32].Key=ring OsInfo[33].Key=expid OsInfo[34].Key=fconid OsInfo[35].Key=containerid OsInfo[36].Key=containertype OsInfo[37].Key=edu OsInfo[37].Value=0 FriendlyEventName=Stopped responding and was closed ConsentKey=AppHangXProcB1 AppName=Thunderbird AppPath=C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe ReportDescription=A problem caused this program to stop interacting with Windows. NsPartner=windows NsGroup=windows8 ApplicationIdentity=BD651D92C43397BE7A26BAF48837601A MetadataHash=-60511867

Every time I open Thunderbird, I get the attached pop-up which I can't delete except when I use control alt delete. It always comes back. How can I permanently delete it? Thanks, Mark

Whilst using TB the screen went white with dozens of little tabs along the top of the screeen with what look like page icons, as the app became 'not responding'. Re-loading didn't help - same screen. Re-starting didn't help. I uninstalled and re-installed TB but it is stil the same. Opening in Windows (11) safe mode produced virtually the same result except for a few seconds I was able to open the hamburger menu and select trouble shooting. Opened in trouble shooting mode showed several alerts of 'failed to connect with servers' (outlook.office365.com imap.gmail.com and Yahoo). Then it shut down as before 'not responding'. When open, TB is using some 80% of available memory., and I can only close it by using Task Manager. I'm a complete dunce at this stuff so, if anyone knows a way out of this hole, please use simple English! Thanks, Jeff

I have followed all the other recommendations with, no luck. I am on Windows 11 and use Eset virus software. Thunderbird is not listed as running it Task Manager, and there is no Profile.lock (think that was what it was called) in the profile directory, and I have deleted the existing profiles and recreated it. I have uninstalled and reinstall Thunderbird, and I have rebooted my computer. I am frustrated and concerned I will loose saved emails and my address book! Help.

good morning , I am using a mac mini 8 gb ram and the latest ios, avg antivirus and vpn. Following the latest ios update in feb/2026 thunderbird opens then locks with a rotating color circle and force quit is needed to close it. Emails are via the imap and smtp protocols, with both not being recognised by the server. Can you help, I need access to files from thunderbird. Can this be done offline, avoiding the server problem. thank you for your help. Jeff

After Windows installed an update in the middle of the night I can't open Thunderbird and I've tried uninstalling it and reinstalling with success.

It says: Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window.

I've rebooted the PC, shut down the PC, ended the task and still nothing. It seem that Thunderbird didn't shut down correctly and the system still thinks that it's open and running. Anyone know how I can fix this issue?

Thanks,

Gregg

Program is freezing after a few minutes, even without using, Tried repairing all the folders and everything I could find on google, installed on another laptop, But still the same.

Can you please help me ? Why does my Thunderbird email account keep crashing upon startup ? It comes up everytime and after 1 minute it crashes . I receive email but only if it is that 1 minute time frame . It just started yesterday , 3/23/2026.

Stephanie

I was using TB like normally on windows 11 when it crashed. Now every time i try to open the app it prompts me to send in a crash report, but every time i press "restart thunderbird" a new window with crash report shows up. I have tried writing a comment, checking and unchecking all the boxes and pressing quit thunderbird. But i still get sent into the loop.

2 months ago, after an update the programme opens then locks with the cursor being a multicolor rotating wheel. All is locked and the only option is to 'Force Quit" to close the programme down. Can you help ? thank you

I have never deleted so many emails at one time, around 500. Did I exceed the limits of Thunderbird? I cannot log on. Cannot see new emails. I have been on emailsrvr.com and did verify my passwords. Thank You

Deleted around 400 unread emails at one time, something not done before. Thunderbird shut down, now can not log in. Do not have backup password or two step authorization. Any hope for getting back in?

Good morning

Since this morning (05/03/2026) Thunderbird freezes within a minute or two of opening the program.

Everything in the program freezes up. I cannot even close it.

I am running Version 140.8.0esr on a Windows 10 PC.

Initially I was getting a pop up warning message that ask me to confirm if I wanted to send an email with attachments of over 20 MB. There were 3 or 4 such messages. I had not tried to send such emails.

I checked the Outbox in Local folders for old messages, but it was empty. I also checked the Unsent messages files in Local Folders in the Profile folder. I deleted the Unsent Messages.msf file to no effect. I renamed and replaced the Unsent messages file. Also no change.

I checked for crash logs but there are none.

I have run out of ideas as to what to try next. Does anyone have any advice?

It's pretty much in the title. My in box freezes up and no emails arrive. Microsoft will drop drop down a box asking me if I want to open THUNDERBIRD and says make sure I'm using a trusted server - app??? I don't understand any of this!

I want to be able to switch a large chunk of my email archive "off" so it doesn't automatically load when Thunderbird launches (and consequently is invisible to search), but then bring it back online whenever I need to search deeply.

My Local Folders weigh in at 15 Gb. When Thunderbird launches, which currently takes a few minutes, Task Manager shows it takes up 1.8 Gb of memory, which I assume includes Thunderbird code plus an index it builds of all the messages in my folders. Not only does Thunderbird slow to a crawl and sometimes freeze up and crash, but this memory load appears to be slowing down my computer as a whole.

I can remove archives from the picture manually now: I can close Thunderbird, use File Manager to move the folders I want to be invisible to a location outside of Thunderbird's ken, and relaunch Thunderbird. And then reverse the process the next time I need to perform a deeper archive search. The fly in the ointment is that moving all those tens of thousands of EML files takes time and increases the possibility of file damage each time. It seems like moving the river to fill a bucket.

Another less than ideal solution now is to maintain two copies of Thunderbird, one for current and recent mail and another dedicated to archive folders. We'd have to perform a search in both Thunderbirds to be sure we'd found all instances of something.

I'd like to be able to simply toggle a local folder's visibility within the Thunderbird user interface.

Ideally, Thunderbird would be able to remove a folder from memory when I toggled it to invisible, increasing response time on the fly. But even if I had to reboot Thunderbird to get new visibility settings to affect its RAM footprint, being able to easily toggle folder visibility would still be a huge boon.

In the user interface, I imagine Toggle Folder Visibility added to the Tools menu. This function would display a checkbox next to each local folder showing its visibility status: checked for visible (the default), unchecked for hidden. It would be necessary to click Save for Thunderbird to act on changed visibility requests. Subsequently, hidden folders would be shown dimmed in the folder tree and their contents invisible. Searches would skip over them automatically.

Your thoughts?

Juniper