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My user upgraded Thunderbird to v136 and no longer can sync his calendar on our IMAP server (Cyrus). When Thunderbird attempts to log into the calendar Cyrus logs an "Internal Server Error" with the detail

May 5 15:11:39 XXXXX cyrus/https[198300]: badlogin: [10.8.0.10] Basic SASL(-1): generic failure: All-whitespace username. May 5 15:11:39 XXXXX cyrus/https[198300]: [10.8.0.10] with "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Thunderbird/138.0" via SESSIONID=<cyrus-1746483098-198300-1-4996003587903488780>; "PUT /dav/calendars/user/XXXXX/Default/040000008200E00074C5B7101A82E00800000000E0076891A1BDDB0100000000000000001000000076BAF045101B7D4EA90CA085DF4D7B11.ics HTTP/2" (if-none-match=*) => "HTTP/2 500 Internal Server Error" (stream-id=3; error=The server encountered an internal error.) [timing: cmd=0.000448 net=0.000035 total=0.000483]

The user can access their email so their account username/password is stored correctly in Thunderbird, it's just not making it to the calendar subsystem.

Failure is 100%. The user can access their calendar from the previous version of Thunderbird and by using another app on their phone.

I'm trying to connect Thunderbird to my Mailcow server SOGo Calendar, but it does not work. It's not a typical problem, because SOGo generates for me two CalDAV links to connect this: 1. Link for signed in users (with RW access). 2. Public access link (with RO access). I want to manage my own calendar, so I need first case. Then I go to "Creating new calendar" window in thunderbird, enter public access link just to check, and calendar is connected! But it's not all. Then I go back and paste link number 1, also providing credentials info (I have tried a lot of variants, also "test@example.com:password", "test@example.com" and so on) and after pressing "Next" button I get a typical connect error like "Could not find your server, please check entered info".

I have done a lot of tests and checks, and this is a strange details, that I caught and I think it is a Thunderbird bug (I might be not right)... On my nginx reverse proxy I see such log when Thunderbird is trying to connect by my link with RW access: "my-ip-address - - [04/Jun/2025:23:39:51 +0300] "mail.example.com" "PROPFIND /SOGo/dav/test@example.com/Calendar/personal/ HTTP/1.1" 404 146 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Thunderbird/139.0.1" "-"". As you can see, my server returned 404 error.

You can think, that problem is on my side and my server is wrong, but please check next nginx log: "my-ip-address - test@example.com [04/Jun/2025:23:38:43 +0300] "mail.example.com" "PROPFIND /SOGo/dav/test@example.com/Calendar/personal/ HTTP/1.1" 207 125 "-" "curl/7.88.1" "-"". It is succeeded, but this is after my manual curl command like "curl -v -X PROPFIND "https://mail.example.com/SOGo/dav/test@example.com/Calendar/personal/"". You can compare two strings from nginx log that I provided and you will see the only difference is second dash in first log instead string "test@example.com" in second log. That piece of log string contains nginx variable $remote_user, and that means that Thunderbird while trying to connect my server calendar do not provide auth credentials and send request without any user that I enter to corresponding field before connect attempt.

P.S. You can ask me why do I test connection just by PROPFIND request type, because Thunderbird tries some different ways to connect too. And I will ask that: 1) Only one succeeded request, by what Thunderbird connects to my public calendar is with type PROPFIND (as I can see in nginx reverse proxy logs); 2) Other attempting ways to connect falls with same error and also do not contain any user, as I explained before.

Please give me feedback about way how I can fix that and thank you very much for your support!

Sorry if this is in the wrong place. Did not seem to be an obvious one for my question.

I go tired of the Outlook web client always trying to us AI to assist me. Installed Thunderbird ver 128.6.1 esr on a Ubuntu 24.04 system running Cinnamon desktop. All components are up-to-date (or should be as auto-update is on). System details at end of message.

Screens for mail and tasks are rock solid. The calendar jitters up and down rapidly small amounts. Not the entire page. Just the part where the calendar is displayed. Makes things a tad blurry and is tiring to look at.

Any ideas on how to resolve?

TIA

System:

 Kernel: 6.8.0-52-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0 clocksource: tsc
 Desktop: Cinnamon v: 6.0.4 tk: GTK v: 3.24.41 wm: Muffin v: 6.0.1 vt: 2 dm: GDM3 v: 46.2
   Distro: Cinnamon 24.04.1 LTS (Noble Numbat) base: Ubuntu

Machine:

 Type: Desktop Mobo: Micro-Star model: B550M PRO-VDH WIFI (MS-7C95) v: 1.0
   serial: <superuser required> uuid: <superuser required> UEFI: American Megatrends LLC. v: 2.L0
   date: 07/18/2024

CPU:

 Info: 8-core model: AMD Ryzen 7 5800X bits: 64 type: MT MCP smt: enabled arch: Zen 3+ rev: 2
   cache: L1: 512 KiB L2: 4 MiB L3: 32 MiB
 Speed (MHz): avg: 2589 high: 3681 min/max: 2200/4850 boost: enabled cores: 1: 2200 2: 2880
   3: 3072 4: 2200 5: 2880 6: 2200 7: 3681 8: 2200 9: 3191 10: 2880 11: 3046 12: 2200 13: 2200
   14: 2200 15: 2200 16: 2200 bogomips: 121608
 Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm

Graphics:

 Device-1: NVIDIA GA106 [GeForce RTX 3060] vendor: eVga.com. driver: nvidia v: 550.120
   arch: Ampere pcie: speed: 2.5 GT/s lanes: 16 ports: active: none off: HDMI-A-1
   empty: DP-1,DP-2,DP-3 bus-ID: 2b:00.0 chip-ID: 10de:2503 class-ID: 0300
 Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6 driver: X: loaded: nouveau
   unloaded: fbdev,modesetting,vesa failed: nvidia gpu: nvidia,nvidia-nvswitch display-ID: :1
   screens: 1
 Screen-1: 0 s-res: 2560x1440 s-dpi: 94 s-size: 692x393mm (27.24x15.47") s-diag: 796mm (31.33")
 Monitor-1: HDMI-0 res: 2560x1440 hz: 60 dpi: 93 size: 697x392mm (27.44x15.43")
   diag: 800mm (31.48") modes: N/A
 API: EGL v: 1.5 hw: drv: nvidia platforms: device: 0 drv: nvidia device: 2 drv: swrast
   surfaceless: drv: nvidia x11: drv: nvidia inactive: gbm,wayland,device-1
 API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 550.120 glx-v: 1.4 direct-render: yes
   renderer: NVIDIA GeForce RTX 3060/PCIe/SSE2

Audio:

 Device-1: Creative Labs CA0132 Sound Core3D [Sound Blaster Recon3D / Z-Series BlasterX AE-5 Plus]
   driver: snd_hda_intel v: kernel pcie: speed: 2.5 GT/s lanes: 1 bus-ID: 04:00.0 chip-ID: 1102:0012
   class-ID: 0403
 Device-2: NVIDIA GA106 High Definition Audio vendor: eVga.com. driver: snd_hda_intel v: kernel
   pcie: speed: 16 GT/s lanes: 16 bus-ID: 2b:00.1 chip-ID: 10de:228e class-ID: 0403
 Device-3: AMD Starship/Matisse HD Audio vendor: Micro-Star MSI driver: snd_hda_intel v: kernel
   pcie: speed: 16 GT/s lanes: 16 bus-ID: 2d:00.4 chip-ID: 1022:1487 class-ID: 0403
 API: ALSA v: k6.8.0-52-generic status: kernel-api
 Server-1: PipeWire v: 1.0.5 status: active with: 1: pipewire-pulse status: active
   2: wireplumber status: active 3: pipewire-alsa type: plugin

Network:

 Device-1: MEDIATEK MT7922 802.11ax PCI Express Wireless Network Adapter driver: mt7921e v: kernel
   pcie: speed: 5 GT/s lanes: 1 bus-ID: 29:00.0 chip-ID: 14c3:0616 class-ID: 0280
 IF: wlo1 state: up mac: <filter>
 Device-2: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet vendor: Micro-Star MSI
   RTL8111/8168/8411 driver: r8169 v: kernel pcie: speed: 2.5 GT/s lanes: 1 port: f000
   bus-ID: 2a:00.0 chip-ID: 10ec:8168 class-ID: 0200
 IF: enp42s0 state: down mac: <filter>
 IF-ID-1: surfshark_ipv6 state: unknown speed: N/A duplex: N/A mac: <filter>
 IF-ID-2: surfshark_wg state: unknown speed: N/A duplex: N/A mac: N/A

Bluetooth:

 Device-1: MediaTek Wireless_Device driver: btusb v: 0.8 type: USB rev: 2.1 speed: 480 Mb/s
   lanes: 1 bus-ID: 1-9:7 chip-ID: 0e8d:0616 class-ID: e001 serial: <filter>
 Report: hciconfig ID: hci0 rfk-id: 0 state: down bt-service: enabled,running rfk-block:
   hardware: no software: yes address: <filter>

Drives:

 Local Storage: total: 931.51 GiB used: 171.93 GiB (18.5%)
 ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 980 PRO with Heatsink 1TB size: 931.51 GiB
   speed: 63.2 Gb/s lanes: 4 tech: SSD serial: <filter> fw-rev: 5B2QGXA7 temp: 34.9 C scheme: GPT

Partition:

 ID-1: / size: 914.78 GiB used: 171.92 GiB (18.8%) fs: ext4 dev: /dev/nvme0n1p2
 ID-2: /boot/efi size: 1.05 GiB used: 6.1 MiB (0.6%) fs: vfat dev: /dev/nvme0n1p1

Swap:

 ID-1: swap-1 type: file size: 8 GiB used: 0 KiB (0.0%) priority: -2 file: /swap.img

USB:

 Hub-1: 1-0:1 info: hi-speed hub with single TT ports: 10 rev: 2.0 speed: 480 Mb/s lanes: 1
   chip-ID: 1d6b:0002 class-ID: 0900
 Device-1: 1-3:2 info: HP HP USB Mass Storage Device type: mass storage driver: usb-storage
   interfaces: 1 rev: 2.0 speed: 480 Mb/s lanes: 1 power: 500mA chip-ID: 03f0:5907 class-ID: 0806
   serial: <filter>
 Device-2: 1-6:3 info: Logitech Logi Bolt Receiver type: keyboard,mouse,HID
   driver: hid-generic,hid-multitouch,usbhid interfaces: 4 rev: 2.0 speed: 12 Mb/s lanes: 1
   power: 98mA chip-ID: 046d:c548 class-ID: 0300
 Hub-2: 1-7:4 info: Genesys Logic Hub ports: 4 rev: 2.0 speed: 480 Mb/s lanes: 1 power: 100mA
   chip-ID: 05e3:0608 class-ID: 0900
 Device-1: 1-7.1:6 info: Thermaltake 3.9 inch Bar Type TFT LCD Display Module-B type: HID
   driver: hid-generic,usbhid interfaces: 2 rev: 1.1 speed: 480 Mb/s lanes: 1 power: 100mA
   chip-ID: 264a:233d class-ID: 0300 serial: <filter>
 Device-2: 1-8:5 info: Micro Star MYSTIC LIGHT type: HID driver: hid-generic,usbhid
   interfaces: 1 rev: 1.1 speed: 12 Mb/s lanes: 1 power: 500mA chip-ID: 1462:7c95 class-ID: 0300
   serial: <filter>
 Device-3: 1-9:7 info: MediaTek Wireless_Device type: bluetooth driver: btusb interfaces: 3
   rev: 2.1 speed: 480 Mb/s lanes: 1 power: 100mA chip-ID: 0e8d:0616 class-ID: e001 serial: <filter>
 Hub-3: 2-0:1 info: super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s lanes: 1 chip-ID: 1d6b:0003
   class-ID: 0900
 Hub-4: 3-0:1 info: hi-speed hub with single TT ports: 4 rev: 2.0 speed: 480 Mb/s lanes: 1
   chip-ID: 1d6b:0002 class-ID: 0900
 Hub-5: 4-0:1 info: super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s lanes: 1 chip-ID: 1d6b:0003
   class-ID: 0900

Sensors:

 System Temperatures: cpu: 36.5 C mobo: 32.0 C gpu: nvidia temp: 34 C
 Fan Speeds (rpm): N/A gpu: nvidia fan: 0%

Repos:

 Packages: 2601 pm: dpkg pkgs: 2561 pm: flatpak pkgs: 19 pm: snap pkgs: 21
 No active apt repos in: /etc/apt/sources.list
 Active apt repos in: /etc/apt/sources.list.d/brave-browser-release.list
   1: deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg] https: //brave-browser-apt-release.s3.brave.com/ stable main
 Active apt repos in: /etc/apt/sources.list.d/onedrive.list
   1: deb [arch=amd64 signed-by=/usr/share/keyrings/obs-onedrive.gpg] https: //download.opensuse.org/repositories/home:/npreining:/debian-ubuntu-onedrive/xUbuntu_24.04/ ./
 Active apt repos in: /etc/apt/sources.list.d/surfshark.list
   1: deb https: //ocean.surfshark.com/debian stretch main
 Active apt repos in: /etc/apt/sources.list.d/ubuntu-esm-apps.sources
   1: deb https: //esm.ubuntu.com/apps/ubuntu noble-apps-security noble-apps-updates main
 Active apt repos in: /etc/apt/sources.list.d/ubuntu-esm-infra.sources
   1: deb https: //esm.ubuntu.com/infra/ubuntu noble-infra-security noble-infra-updates main
 Active apt repos in: /etc/apt/sources.list.d/ubuntu.sources
   1: deb http: //archive.ubuntu.com/ubuntu/ noble noble-updates noble-backports main restricted universe multiverse
   2: deb http: //security.ubuntu.com/ubuntu/ noble-security main restricted universe multiverse

Info:

 Memory: total: 32 GiB available: 31.26 GiB used: 3.65 GiB (11.7%)
 Processes: 398 Power: uptime: 1h 0m states: freeze,mem,disk suspend: deep wakeups: 0
   hibernate: platform Init: systemd v: 255 target: graphical (5) default: graphical
 Compilers: gcc: 13.3.0 Client: Cinnamon v: 6.0.4 inxi: 3.3.34

Using Thunderbird 128.5.0esr (64-bit) on 128.5.0esr (64-bit). In calendar view, I see all my appointments with the background colour of the calendar they are in (see attached). In my inbox view, I have the Events tab open at the right. All day events have the background colour of the appropriate calendar, but ones with timings have a dot. (see attached). How do I make ALL calendar events have the background colour of the associated calendar in the mail events tab??

Hi everyone.

Hoping someone may be able to help. I see that other users are able to fully highlight the events in calendar. I seem to be only able to highlight 2/3's (see image)

Thanks in advance

I have been very happy using Thunderbird to access the email account of my volunteer position, I have always used the Email, Calendar and Task feature. I have the automatic updates setup on Thunderbird and until recently had no issues at all, until the last update. When Thunderbird first started with the newest update the calendar details were visible and then Thunderbird disabled the Calendar and Task and no matter how many time I click the Enable button or edit the properties to say enable Thunderbird immeadiately sets it back to Disabled. I have uninstalled Thunderbird, and relinstalled an older version - problem there doesn't seem to be a profile to match, so I just kept manually updating Thunderbird to a newer update until the absolute latest, but there were issues with the profiles again. I then uninstalled and installed the latest version available directly from the website and was able to get another profile to work for my local folders - I had saved some docs locally to conserve disk space on the email server. But no matter what I cannot get the calendar to work at all. There are no posts that cover this particular situation. Any idea how to fix this???? Thank you to anyone that offers assistance with this issue.

The time shown in the Date column for TB is 2 hrs earlier than the actual time. The TB error console also displays the wrong time.

TB 128.6.0esr on freebsd-13.4-RELEASE-p5

System time is set to and displays as MDT (US Mountain/Denver) $ date Fri Apr 18 12:29:52 MDT 2025

TB error console: Date() "Fri Apr 18 2025 10:31:04 GMT-0800 (GMT-08:00)"

about:config timezone settings: calendar.timezone.local MST calendar.timezone.recent [] calendar.timezone.useSystemTimezone true mailnews.sender.date_senders_timezone false

Mail headers show proper time in mail file: Received: from mail-yb1-f187.google.com (mail-yb1-f187.google.com [209.85.219.187]) ... for <xxx>; Fri, 18 Apr 2025 11:55:40 -0600 (MDT) Received: by mail-yb1-f187.google.com with SMTP id 3f1490d57ef6-e5740c858besf2902470276.2 ... for <xxx>; Fri, 18 Apr 2025 10:55:39 -0700 (PDT)

And display properly in the TB headers display: Date Fri, 18 Apr 2025 11:55:29 -0600

Yet TB displays 2 hrs earlier in the Date column: 09:55

How to correct? I had set the Calendar timezone manually, but it is now set as above. I tried deleting calendar.timezone.local but it is rewritten when TB exits.

After the last update of Thunderbird the calendar will not hold the sync with Outlook calendar. I tried resetting the sync link without success.TB will flash the events from Outlook when I click the "Enable" button but not hold them. Is there a solution?

I believe I have noticed a change in the operation of Calendar Event notifications, following recent updates to Thunderbird, in the past week or more. I am currently on release 137.0.2 (64-bit) running on a Linux Desktop. This computer gets shut down every night, and rebooted the following morning. When a calendar reminder has been snoozed, and the snooze time expires when the computer is not running, and Thunderbird is not running, those calendar reminders used to show up the next time Thunderbird was started after the computer was rebooted, even if the calendar event time had already passed. In the last week or so, following recent updates, I believe this is no longer happening.

Also, I believe that calendar events that have reminders set, that have not been snoozed, whose reminder time happens when the computer is shut down, are also not being shown reminders the next time the computer is started, if the reminder time happened when Thunderbird was not running. This is also a change from the way it used to work. For example, if an event is marked as starting at 10:00 AM, with a reminder set for 2 hours before (which would be 8 AM), and the computer is booted and Thunderbird is started at 8:30 AM, that reminder no longer happens. That is a change from the way it used to work. A few weeks ago, in that scenario, the reminder would have been shown the next time Thunderbird started up.

I have run into a calendar notification bug when Thunderbird is not executing. This started about a month ago and may be due to changes in the 140esr release (I was on 128esr previously).

Suppose I set an appointment for tomorrow at 9pm and ask the calendar to notify me a day in advance. If Thunderbird is executing at 9pm on day before, this works fine. If Thunderbird is not active, the notification is never made when I open Thunderbird after 9 pm on the day before the appointment.

This problem also occurs if I Snooze the notification and do not have Thunderbird running when the snooze period is completed. If does work if Thunderbird is open at the time of Snooze completion.

I have tested this on two different computers, a desktop and notebook, both running Windows 10. Currently running Thunderbird 140.2.0esr.

I have missed two appointments when Thunderbird calendar did not warn me about them.

(1) Please add more choices to the Triage Topics dropdown list:

• CALENDAR  !!!
• OTHER [with text-entry box]
• ... ??? ...

(2) REMINDER PANEL is UNRELIABLE. see attached screenshot file: (REMINDER PANEL is UNRELIABLE.png)

Thank you, Mike Ramey

would like to open lightning (calendar) from desktop w/o opening Thunderbird. Have W-10 home, Thunderbird is v-45.5.0 Thanks PS make it easy on directions as I am in the PC learning stage at 75 DJ

I would like to create a calendar event directly from an email message so that the event links to the email or at least contains the information in the message. It looks like this does not exist in Lightning but perhaps there is an add-on?

If there is no way to do that directly, what is the best option for linking to the information in the email message? Just cutting and pasting the information in the message? It would be better to link to the email directly but maybe that is not possible.

I thought I could save the email as a file and then save it as an attachment to the event. However, when I click "Attachment" at the bottom of the event, nothing seems to happen. No new window opens so I cannot select a file. Does this mean that my installation may be corrupt?

My calendar has disappeared. I have years of important dates that are lost. . . say it ain't so, Mozilla! WTF. My "add-ons" show nothing installed. Are you kidding me? They broke Thunderbird?

tried to follow the instructions but the config option to reset in the config manager doesn't exist

https://i.imgur.com/G6H5CT0.png