I have just had a crash report (it happened again) details below.

AdapterDeviceID: 0x1906 AdapterDriverVersion: 21.20.16.4542 AdapterSubsysID: 505917aa AdapterVendorID: 0x8086 Add-ons: %7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D:52.4.0,langpack-en-GB%40thunderbird.mozilla.org:52.0,marcoagpinto%40mail.telepac.pt:2.54 AvailablePageFile: 1005486080 AvailablePhysicalMemory: 211259392 AvailableVirtualMemory: 154460160 BIOS_Manufacturer: LENOVO BlockedDllList: BreakpadReserveAddress: 39976960 BreakpadReserveSize: 67108864 BuildID: 20171004092449 CPUMicrocodeVersion: 0x9e ContentSandboxCapable: 1 ContentSandboxLevel: 0 CrashTime: 1510649723 EMCheckCompatibility: true FramePoisonBase: 00000000f0de0000 FramePoisonSize: 65536 InstallTime: 1508329544 MozCrashReason: MOZ_CRASH() Notes: AdapterVendorID: 0x8086, AdapterDeviceID: 0x1906, AdapterSubsysID: 505917aa, AdapterDriverVersion: 21.20.16.4542 FP(D10-L1100-W00001000-T0000) DWrite? DWrite+ OOMAllocationSize: 76 ProductID: {3550f703-e582-4d05-9a08-453d09bdfdc6} ProductName: Thunderbird ReleaseChannel: release SafeMode: 0 SecondsSinceLastCrash: 701 StartupCrash: 0 StartupTime: 1510649437 SystemMemoryUsePercentage: 94 TelemetryEnvironment: {"build":{"applicationId":"{3550f703-e582-4d05-9a08-453d09bdfdc6}","applicationName":"Thunderbird","architecture":"x86","buildId":"20171004092449","version":"52.4.0","vendor":null,"platformVersion":"52.4.0","xpcomAbi":"x86-msvc","hotfixVersion":null},"partner":{"distributionId":null,"distributionVersion":null,"partnerId":null,"distributor":null,"distributorChannel":null,"partnerNames":[]},"system":{"memoryMB":3994,"virtualMaxMB":4096,"cpu":{"count":2,"cores":2,"vendor":"GenuineIntel","family":6,"model":78,"stepping":3,"l2cacheKB":256,"l3cacheKB":2048,"speedMHz":1608,"extensions":["hasMMX","hasSSE","hasSSE2","hasSSE3","hasSSSE3","hasSSE4_1","hasSSE4_2"]},"os":{"name":"Windows_NT","version":"10.0","locale":"en-GB","servicePackMajor":0,"servicePackMinor":0,"windowsBuildNumber":15063,"windowsUBR":674,"installYear":2017},"hdd":{"profile":{"model":"SAMSUNG MZNTY128HDHP-000L1","revision":"MAT23L0Q"},"binary":{"model":"SAMSUNG MZNTY128HDHP-000L1","revision":"MAT23L0Q"},"system":{"model":"SAMSUNG MZNTY128HDHP-000L1","revision":"MAT23L0Q"}},"gfx":{"D2DEnabled":false,"DWriteEnabled":true,"ContentBackend":"Skia","adapters":[{"description":"Intel(R) HD Graphics 510","vendorID":"0x8086","deviceID":"0x1906","subsysID":"505917aa","RAM":null,"driver":"igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32","driverVersion":"21.20.16.4542","driverDate":"10-24-2016","GPUActive":true}],"monitors":[{"screenWidth":1920,"screenHeight":1080,"refreshRate":59,"pseudoDisplay":false}],"features":{"compositor":"basic","d3d11":{"status":"unavailable"},"d2d":{"status":"unavailable","version":"1.1"}}},"isWow64":true},"settings":{"blocklistEnabled":true,"e10sEnabled":false,"e10sCohort":"unknown","telemetryEnabled":true,"locale":"en-GB","update":{"channel":"release","enabled":true,"autoDownload":true},"userPrefs":{"browser.cache.disk.capacity":358400},"addonCompatibilityCheckEnabled":true,"isDefaultBrowser":null},"profile":{"creationDate":17197},"addons":{"activeAddons":{},"theme":{"id":"{972ce4c6-7e08-4474-a285-3208198ce6fd}","blocklisted":false,"description":"The default theme.","name":"Default","userDisabled":false,"appDisabled":false,"version":"52.4.0","scope":4,"foreignInstall":false,"hasBinaryComponents":false,"installDay":17190,"updateDay":17457},"activePlugins":[{"name":"Shockwave Flash","version":"27.0.0.183","description":"Shockwave Flash 27.0 r0","blocklisted":false,"disabled":false,"clicktoplay":false,"mimeTypes":["application/x-shockwave-flash","application/futuresplash"],"updateDay":17468}],"activeGMPlugins":{},"activeExperiment":{},"persona":null}} Theme: classic/1.0 Throttleable: 1 TotalPageFile: 9643503616 TotalPhysicalMemory: 4187504640 TotalVirtualMemory: 4294836224 URL: UptimeTS: 448.110879017 Vendor: Version: 52.4.0 Winsock_LSP: Hyper-V RAW : 2 : 34 : 1 : 1 : 0x20026 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : 1234191b-4bf7-4ca7-86e0-dfd7c32b5445

MSAFD Tcpip [TCP/IP] : 2 : 2 : 1 : 6 : 0x20066 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : e70f1aa0-ab8b-11cf-8ca3-00805f48a192 
MSAFD Tcpip [UDP/IP] : 2 : 2 : 2 : 17 : 0x20609 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : e70f1aa0-ab8b-11cf-8ca3-00805f48a192 
MSAFD Tcpip [RAW/IP] : 2 : 2 : 3 : 0 : 0x20609 : 0xc : %SystemRoot%\system32\mswsock.dll :  : e70f1aa0-ab8b-11cf-8ca3-00805f48a192 
MSAFD Tcpip [TCP/IPv6] : 2 : 23 : 1 : 6 : 0x20066 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : f9eab0c0-26d4-11d0-bbbf-00aa006c34e4 
MSAFD Tcpip [UDP/IPv6] : 2 : 23 : 2 : 17 : 0x20609 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : f9eab0c0-26d4-11d0-bbbf-00aa006c34e4 
MSAFD Tcpip [RAW/IPv6] : 2 : 23 : 3 : 0 : 0x20609 : 0xc : %SystemRoot%\system32\mswsock.dll :  : f9eab0c0-26d4-11d0-bbbf-00aa006c34e4 
RSVP TCPv6 Service Provider : 2 : 23 : 1 : 6 : 0x22066 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : 9d60a9e0-337a-11d0-bd88-0000c082e69a 
RSVP TCP Service Provider : 2 : 2 : 1 : 6 : 0x22066 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : 9d60a9e0-337a-11d0-bd88-0000c082e69a 
RSVP UDPv6 Service Provider : 2 : 23 : 2 : 17 : 0x22609 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : 9d60a9e0-337a-11d0-bd88-0000c082e69a 
RSVP UDP Service Provider : 2 : 2 : 2 : 17 : 0x22609 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : 9d60a9e0-337a-11d0-bd88-0000c082e69a 
MSAFD Irda [IrDA] : 2 : 26 : 1 : 1 : 0x20006 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : 3972523d-2af1-11d1-b655-00805f3642cc 
MSAFD RfComm [Bluetooth] : 2 : 32 : 1 : 3 : 0x20026 : 0x8 : %SystemRoot%\system32\mswsock.dll :  : 9fc48064-7298-43e4-b7bd-181f2089792a

useragent_locale: en-GB

This report also contains technical information about the state of the application when it crashed.

Please post your crash IDs. See https://support.mozilla.org/en-US/kb/mozilla-crash-reporter#w_viewing-crash-reports

Report ID Date Submitted bp-8f9643fa-9af2-4cdd-9160-b4bd30171114 14/11/17 09:32 bp-c51bad3d-c478-4afb-a370-8197a0171114 14/11/17 08:43 bp-fa030a56-a12b-43bd-93a1-ee6860171102 02/11/17 09:24 bp-0f931892-647b-4d13-8751-e018d0171030 30/10/17 14:45 bp-48c38c41-d2bf-4283-b506-341d30171011 11/10/17 10:53 bp-a6af7d01-6fe6-44b9-a196-f9d6c0171009 09/10/17 17:20 bp-41159c9e-52c4-4a77-9f71-fd2740171009 09/10/17 17:10 bp-019fff97-6e7a-4e30-898b-2d0cd0170920 20/09/17 12:09 bp-88e2a744-247c-4f7c-b3b0-3b0790170920 20/09/17 11:16 bp-82c1b4cc-3e6e-475f-95f1-895b10170906 06/09/17 11:31 bp-bd1d0b1b-8219-42e5-87b5-38ada0170807 07/08/17 10:14 bp-fd07e0c7-7ab9-4234-83f3-a90620170727 27/07/17 21:38 bp-0488822f-a5cc-4a18-a14d-48f350170727 27/07/17 16:12 bp-9100a294-437a-401d-b8d4-52e4c0170727 27/07/17 15:19 bp-9a303271-c3ec-4898-b679-0efc20170727 27/07/17 15:19 bp-56c882c8-3180-45cd-8623-643dd0170727 27/07/17 14:33 bp-0859aaf1-0bad-477a-bf24-e99c00170727 27/07/17 14:32 bp-d2a0f47d-d37b-4928-9fbf-13b150170718 18/07/17 09:13 bp-8fec5666-4af3-4c88-852d-0f5b20170627 27/06/17 10:25 bp-47d56ebf-30be-4e78-8592-d361d0170626 26/06/17 12:08 bp-442e7c35-f39d-43ec-bf7c-cf8bf0170626 26/06/17 11:16 bp-84740dd5-50ec-466a-a69d-a199a0170626 26/06/17 11:15 bp-c4e513ec-03e7-4ff1-a81a-453ce0170626 26/06/17 10:42

All of your crashes are @ OOM | small, mostly after 1-2 hours.

Please test by disabling your addons one at a time. When Thunderbird doesn't fail, then the last addon disabled is your likely cause. If we can reproduce this issue, I'd really like us to investigate your issue in more depth so we can hopefully find a fix.

Are all your crashes during message compose? Please post your results

Hi. I have turned off all add ons and over the last week I have been re-enabling a new one every few days to see what causes the problem. I first re-enabled Shockwave Flash, then left this enabled and added English GB language pack. I left this enabled and finally enabled the British English Dictionary (Marco Pinto). This last add on again triggered the error so it seems to be this causing the problem. I have disabled it now but now have no spell checker on my email which is not ideal. Does anyone have a solution to this?

Sorry forgot to say yes crashes are always during message compose