Thunderbird 91.0.3 is a small bug fix release

Thunderbird 91.0.3 is the third small bug fix release for the new main version of the open source email client, Thunderbird 91.

Thunderbird 91 was released just two weeks ago on August 13, 2021. The two updates that followed, fixed bugs but no security issues in the client.

The newest bug fix release, Thunderbird 91.0.3 is already available. Thunderbird includes automatic updating functionality, and most clients should pick up the new version automatically. You may select Help > About Thunderbird to display the current version and run a manual check for update; this should pick up, download and install the new version right away. The new version is also available on the official Thunderbird website for all supported operating systems as a direct download.

Thunderbird 91.0.3: release information

thunderbird 91.0.3

Thunderbird 91.0.3 is a non-security bug fix release that addresses 12 bugs found in previous versions of the email client. There is no rush to install the update, unless you are affected by one or multiple of the issues fixed in the release.

Here is the list of fixes in Thunderbird 91.0.3:

  • Some servers rejected Thunderbird email messages as the client was sometimes sending an unnecessary "SMTPUTF8" with the message.
  • Server descriptions in the account settings were not displayed correctly for non-UTF-8 servers.
  • Account setup UX fixes when using Exchange auto-discover.
  • The unread message count badge on the Windows taskbar did not update itself if unread mail was moved to the junk folder.
  • The date and time format of email based event scheduling was displayed in a format unreadable by humans.
  • Today Pane fixes:
    • Filtering tasks did not work.
    • The mouseover popup was not displayed for all events that were not all-day.
  • Folder pane toolbar did not always persist between sessions.
  • Linked favicons in HTML messages could override folder icons.
  • Unified folders did not show a message if underlying folders were removed.
  • The compose window attachment pane was not closed when the signing of an OpenPGP message was disabled.
  • Some list emails opened a "no-reply" warning when using "reply to list".

You may check out the entire list of changes on the official Thunderbird website.

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Thunderbird 91.0.3 is a small bug fix release
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Thunderbird 91.0.3 is a small bug fix release
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Thunderbird 91.0.3 is the third small bug fix release for the new main version of the open source email client, Thunderbird 91.
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Comments

  1. owl said on August 26, 2021 at 10:17 am
    Reply

    Caution!
    Existing users who are currently using Thunderbird “78” series, please do not perform manual updates to “91” series!

    Existing users of the “78” series don’t need to rush to update to the major upgrade “91” series!
    Thunderbird is based on the Firefox ESR (Extended Support Release) platform, which provides long-term support for security patches and bug fixes, with new features added “at the time of major upgrade”.

    The final version of the “78” series is 78.15.x (Release Date: 2021-10-05) and will continue to be supported until The final version of “78” series is 78.15.x (Release Date: 2021-10-05), and the support will be continued until “Thunderbird 91.3” which is scheduled to be released on 2021-11-02.

    “Since ESR is used as the platform, new features will be added at once during major upgrades. Due to the differences before and after the update, may cause problems.
    For this reason, “automatic updates” have been blocked.
    You can update manually at your discretion, but please wait for the automatic update (which will be performed after the block is lifted).

    Thunderbird is a “web client” mail client.
    A computer or software that provides information on the Web is called a “Web server”.
    A computer or software that receives information from a server and displays or processes it through user operation is called a “Web client”.
    Among web clients, a web browser is used to format the contents of a received page and display it on a screen for human viewing.
    A “mail client” is also a type of web client. It receives information from the server of the provider where the entity of the message (e-mail) resides (in the case of Microsoft, it just reads the entity that resides in @outlook.com, @hotmail.com, etc.).

    The web client “Thunderbird” has been developed from the perspective of ecosystem (security measures and maintainability) The web client “Firefox ESR” is used as the platform.

    The purpose of the ESR specification is to ensure stability, which is of utmost importance to corporate users, and the addition of new features that may compromise stability is “limited, in principle, to annual major upgrades.
    In order to make corrections based on unexpected problems and user responses during major upgrades, “automatic updates” during major upgrades are reserved (blocked) for existing “ESR” users.
    In other words, existing users should wait for the “automatic update” instead of rushing for the manual update.

    About “Firefox 78 ESR”
    Future branch dates | wiki.mozilla.org
    https://wiki.mozilla.org/Release_Management/Calendar
    At the moment, it is “78.13.0esr”, but the final version in the 78 series ESR is Firefox 78.15esr (Release Date: 2021-10-05) is the last security update for the current “ESR 78” series and support will continue until the next major upgrade, “ESR 91” series, 91.3 (Release Date: 2021-11-02).
    However, in rare cases, the release date may be postponed.

    About Official Framework
    Firefox Release Calendar | wiki.mozilla.org
    https://wiki.mozilla.org/Release_Management/Calendar
    This schedule is based on the current RapidRelease plan. Future dates may change if the process changes. Code is not always released to users on the same day as the branch migration. The release to users may be a few days later, to allow for manual testing and sign-off. Thunderbird tracks the ESR schedule column per Thunderbird release info.
    ESR Landing Process | wiki.mozilla.org
    https://wiki.mozilla.org/Release_Management/ESR_Landing_Process

  2. owl said on August 26, 2021 at 10:28 am
    Reply

    Caution!
    Existing users who are currently using Thunderbird “78” series, please do not perform manual updates to “91” series!

    Existing users of the “78” series don’t need to rush to update to the major upgrade “91” series!
    Thunderbird is based on the Firefox ESR (Extended Support Release) platform, which provides long-term support for security patches and bug fixes, with new features added “at the time of major upgrade”.

    The final version of the “78” series is 78.15.x (Release Date: 2021-10-05), and the support will be continued until “Thunderbird 91.3” which is scheduled to be released on 2021-11-02.

    “Since ESR is used as the platform, new features will be added at once during major upgrades. Due to the differences before and after the update, may cause problems.
    For this reason, “automatic updates” have been blocked.
    You can update manually at your discretion, but please wait for the automatic update (which will be performed after the block is lifted).

    Thunderbird is a “web client” mail client.
    A computer or software that provides information on the Web is called a “Web server”.
    A computer or software that receives information from a server and displays or processes it through user operation is called a “Web client”.
    Among web clients, a web browser is used to format the contents of a received page and display it on a screen for human viewing.
    A “mail client” is also a type of web client. It receives information from the server of the provider where the entity of the message (e-mail) resides (in the case of Microsoft, it just reads the entity that resides in @outlook.com, @hotmail.com, etc.).

    The web client “Thunderbird” has been developed from the perspective of ecosystem (security measures and maintainability) The web client “Firefox ESR” is used as the platform.

    The purpose of the ESR specification is to ensure stability, which is of utmost importance to corporate users, and the addition of new features that may compromise stability is “limited, in principle, to annual major upgrades.
    In order to make corrections based on unexpected problems and user responses during major upgrades, “automatic updates” during major upgrades are reserved (blocked) for existing “ESR” users.
    In other words, existing users should wait for the “automatic update” instead of rushing for the manual update.

    About “Firefox 78 ESR”
    Future branch dates | wiki.mozilla.org
    https://wiki.mozilla.org/Release_Management/Calendar
    At the moment, it is “78.13.0esr”, but the final version in the 78 series ESR is Firefox 78.15esr (Release Date: 2021-10-05) is the last security update for the current “ESR 78” series and support will continue until the next major upgrade, “ESR 91” series, 91.3 (Release Date: 2021-11-02).
    However, in rare cases, the release date may be postponed.

    About Official Framework
    Firefox Release Calendar | wiki.mozilla.org
    https://wiki.mozilla.org/Release_Management/Calendar
    This schedule is based on the current RapidRelease plan. Future dates may change if the process changes. Code is not always released to users on the same day as the branch migration. The release to users may be a few days later, to allow for manual testing and sign-off. Thunderbird tracks the ESR schedule column per Thunderbird release info.
    ESR Landing Process | wiki.mozilla.org
    https://wiki.mozilla.org/Release_Management/ESR_Landing_Process

  3. Nelm said on August 26, 2021 at 3:38 pm
    Reply

    Thank you for your information owl

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