Thunderbird 60.6.1 Email Client for PC Windows

What’s New
FIXED
Various security fixes

Known Issues
UNRESOLVED
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC

UNRESOLVED
Chat: Twitter not working due to API changes at Twitter.com

What’s New
FIXED
Calendar: Can't create repeating event with end date when using certain time zones, for example Europe/Minsk

Known Issues
UNRESOLVED
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC

UNRESOLVED
Chat: Twitter not working due to API changes at Twitter.com

What’s New
PARTLY FIXED
Problem when using "Send to > Mail recipient" on Windows introduced in version 60.5.2. Files with non-ASCII characters in their name may still cause a malfunction. Two alternative workarounds exist:
On Windows 10, set the system code page to UTF-8 (beta feature, see Region Settings, system locale)
Reset this registry entry
HKLMSOFTWAREClientsMailMozilla Thunderbird - SupportUTF8 to 0. On also reset HKLMSOFTWAREWow6432NodeClientsMailMozilla Thunderbird - SupportUTF8 if present.
Known Issues
UNRESOLVED
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC

UNRESOLVED
Chat: Twitter not working due to API changes at Twitter.com

What’s New
FIXED
Crash when using "Send to > Mail recipient" on Windows under some circumstances (MAPI interface)

FIXED
UTF-8 support for MAPISendMail

FIXED
Problem with S/MIME certificate verification when receiving email from Outlook (issue introduced in version 60.5.1)

Known Issues
UNRESOLVED
Changes to the MAPI interface have caused problems when sending a file from the Windows desktop or a folder via "Sent to > Mail recipient" or via an external application like an office package, for example LibreOffice. To solve this problem, reinstall Thunderbird 60.5.2 from one of these locations:
https://www.thunderbird.net/en-US/thunderbird/all/
http://ftp.mozilla.org/pub/thunderbird/releases/60.5.2/win32/
http://ftp.mozilla.org/pub/thunderbird/releases/60.5.2/win64/ (unsupported 64bit version).
Files with non-ASCII characters in their name also cause a malfunction. Two alternative workarounds exist:
On Windows 10, set the system code page to UTF-8 (beta feature, see Region Settings, system locale)
Reset this registry entry
HKLMSOFTWAREClientsMailMozilla Thunderbird - SupportUTF8 to 0
UNRESOLVED
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC

UNRESOLVED
Chat: Twitter not working due to API changes at Twitter.com

What’s New
New:
FileLink provider WeTransfer to upload large attachments.
Thunderbird now allows the addition of OpenSearch search engines from a local XML file using a minimal user inferface: [+] button to select a file an add, [-] to remove.
More search engines: Google and DuckDuckGo available by default in some locales.
During account creation, Thunderbird will now detect servers using the Microsoft Exchange protocol. It will offer the installation of a 3rd party add-on (Owl) which supports that protocol.
Fixed:
Thunderbird now compatible with other WebExtension-based FileLink add-ons like the Dropbox add-on.
Crash when using custom sound for new email notification.
Various security fixes.

Known Issues
Unresolved:
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC.
CalDav access to some servers not working. Workaround: Set preference network.cookie.same-site.enabled to false.
Chat: Twitter not working due to API changes at Twitter.com

New
More search engines: Google and DuckDuckGo available by default.

Fixed
Crash when using "Send to > Mail recipient" on Windows under some circumstances (MAPI interface).

What’s New:
FileLink for WeTransfer.
WebExtensions FileLink API to facilitate FileLink add-ons. WeTransfer is already included and Dropbox is available as add-on.
Various theme improvements including a dark message list/thread pane.
When multiple language packs are installed, the UI language can now be selected in the Advanced Options. Preference intl.multilingual.enabled needs to be set (and possily also extensions.langpacks.signatures.required needs to be set to false).

Changed:
ADD-ON SUPPORT: Restartless add-ons continue to work if their authors have made the necessary minor adjustments. Non-restartless legacy add-ons using XUL overlays are only supported if add-on authors have adapted them. Apart from Lightning/Calendar there are a few that have been adapted, like "ThunderHTMLedit", "Compact Header" and "Signature Switch". Instaling legacy add-ons now requires a restart. Legacy add-ons can now specify an options page again.
DICTIONARY SUPPORT: Only WebExtension dictionaries are supported now. Please download new dictionaries from addons.mozilla.org since addons.thunderbird.net still provides "legacy" dictionaries compatible with Thunderbird 60 ESR. This may change as soon as Thunderbird 60 ESR can also handle WebExtension dictionaries (planned for version 60.5).
Reply to self will now search all identities (default of preference mailnews.reply_to_self_check_all_ident changed to true).
Composition text and background colors no longer sent by default. New option in "Tools > Options, Composition".

Fixed:
Address book search and auto-complete slowness introduced in Thunderbird 64 beta.
Plain text markup with * for bold, / for italics, _ for underline and | for code did not work when the enclosed text contained non-ASCII characters.
While composing a message, a link not removed when link location was removed in the link properties panel.
Decoding problems for messages with less common charsets (cp932, cp936).
Spurious 
 (encoded newline) inserted into drafts and sent email.
Double-clicking on a word in the Write window sometimes launched the Advanced Property Editor or Link Properties dialog.
Editing a plaint text draft displayed the entire message as quote (in blue).
New messages in the drafts folder (and other special or virtual folders) will no longer be included in the new messages notification.
Edit > Undo didn't undo moving or deleting of messages.
Improvements of SMTP 5.7.1 message.

Beta 2 - New and Fixed in Thunderbird 65 beta 2:
Thunderbird now allows the addition of OpenSearch search engines from a local XML file using a minimal user inferface: [+] button to select a file an add, [-] to remove. Note: The set of search engines will be improved the next version, Google and DuckDuckGo will be available by default.
During account creation, Thunderbird will now detect servers using the Microsoft Exchange protocol. It will offer the installation of a 3rd party add-on (Owl) which supports that protocol.

Fixed:
Account creation sometimes shows an error: "Programming bug. Assertion failed, see log".
Chat: Participants not sorted (not working since Thunderbird 63 beta).

Known Issues
Unresolved:
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC.
Spellcheck marks disappeared erroneously for words with an apostrophe (working in Thunderbird ESR.
Calendar: A localized version of Provider for Google Calendar not available at addons.thunderbird.net or the Mozilla FTP server. A US-English version can be downloaded here.
Chat: Twitter not working due to API changes at Twitter.com

What’s New
FileLink for WeTransfer
WebExtensions FileLink API to facilitate FileLink add-ons. WeTransfer is already included and Dropbox is available as add-on.
Various theme improvements including a dark message list/thread pane.
When multiple language packs are installed, the UI language can now be selected in the Advanced Options. Preference intl.multilingual.enabled needs to be set (and possily also extensions.langpacks.signatures.required needs to be set to false).

Changed:
ADD-ON SUPPORT: Restartless add-ons continue to work if their authors have made the necessary minor adjustments. Non-restartless legacy add-ons using XUL overlays are only supported if add-on authors have adapted them. Apart from Lightning/Calendar there are a few that have been adapted, like "ThunderHTMLedit", "Compact Header" and "Signature Switch". Instaling legacy add-ons now requires a restart. Legacy add-ons can now specify an options page again.
Reply to self will now search all identities (default of preference mailnews.reply_to_self_check_all_ident changed to true).
Composition text and background colors no longer sent by default. New option in "Tools > Options, Composition".

Fixed:
Address book search and auto-complete slowness introduced in Thunderbird 64 beta.
Plain text markup with * for bold, / for italics, _ for underline and | for code did not work when the enclosed text contained non-ASCII characters.
While composing a message, a link not removed when link location was removed in the link properties panel.
Decoding problems for messages with less common charsets (cp932, cp936).
Spurious 
 (encoded newline) inserted into drafts and sent email.
Double-clicking on a word in the Write window sometimes launched the Advanced Property Editor or Link Properties dialog.
Editing a plaint text draft displayed the entire message as quote (in blue).
New messages in the drafts folder (and other special or virtual folders) will no longer be included in the new messages notification.
Edit > Undo didn't undo moving or deleting of messages.
Improvements of SMTP 5.7.1 message.

Known Issues
Unresolved:
Account creation sometimes shows an error: "Programming bug. Assertion failed, see log". Workaround: Click "Advanced config" button.
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC.
Spellcheck marks disappeared erroneously for words with an apostrophe (working in Thunderbird ESR).
Calendar: A localized version of Provider for Google Calendar not available at addons.thunderbird.net or the Mozilla FTP server. A US-English version can be downloaded here.
Chat: Twitter not working due to API changes at Twitter.com
Chat: Participants not sorted.

What’s New
FileLink for WeTransfer
WebExtensions FileLink API to facilitate FileLink add-ons. WeTransfer is already included and Dropbox is available as add-on.
Various theme improvements including a dark message list/thread pane.
When multiple language packs are installed, the UI language can now be selected in the Advanced Options. Preference intl.multilingual.enabled needs to be set (and possily also extensions.langpacks.signatures.required needs to be set to false).

Changed:
ADD-ON SUPPORT: Restartless add-ons continue to work if their authors have made the necessary minor adjustments. Non-restartless legacy add-ons using XUL overlays are only supported if add-on authors have adapted them. Apart from Lightning/Calendar there are a few that have been adapted, like "ThunderHTMLedit", "Compact Header" and "Signature Switch". Instaling legacy add-ons now requires a restart. Legacy add-ons can now specify an options page again.
Reply to self will now search all identities (default of preference mailnews.reply_to_self_check_all_ident changed to true).
Composition text and background colors no longer sent by default. New option in "Tools > Options, Composition".

Fixed:
Address book search and auto-complete slowness introduced in Thunderbird 64 beta.
Plain text markup with * for bold, / for italics, _ for underline and | for code did not work when the enclosed text contained non-ASCII characters.
While composing a message, a link not removed when link location was removed in the link properties panel.
Decoding problems for messages with less common charsets (cp932, cp936).
Spurious 
 (encoded newline) inserted into drafts and sent email.
Double-clicking on a word in the Write window sometimes launched the Advanced Property Editor or Link Properties dialog.
Editing a plaint text draft displayed the entire message as quote (in blue).
New messages in the drafts folder (and other special or virtual folders) will no longer be included in the new messages notification.
Edit > Undo didn't undo moving or deleting of messages.
Improvements of SMTP 5.7.1 message.

Known Issues
Unresolved:
Account creation sometimes shows an error: "Programming bug. Assertion failed, see log". Workaround: Click "Advanced config" button.
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC.
Spellcheck marks disappeared erroneously for words with an apostrophe (working in Thunderbird ESR).
Calendar: A localized version of Provider for Google Calendar not available at addons.thunderbird.net or the Mozilla FTP server. A US-English version can be downloaded here.
Chat: Twitter not working due to API changes at Twitter.com
Chat: Participants not sorted.

What’s New:
New
WebExtensions FileLink API to facilitate FileLink add-ons for WeTransfer and Dropbox (forthcoming).
Fixed
Decoding problems for messages with less common charsets (cp932, cp936).
New messages in the drafts folder (and other special or virtual folders) will no longer be included in the new messages notification.

Known Issues:
Unresolved
Crash when using custom sound for new email notification. Workaround: Use system sound.
Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC.
CalDav access to some servers not working. Workaround: Set preference network.cookie.same-site.enabled to false.
Chat: Twitter not working due to API changes at Twitter.com

What’s New
Mitigated:
Thunderbird 60 will migrate security databases (key3.db, cert8.db to key4.db, cert9.db). Thunderbird 60.3.2 and earlier contained a fault that potentially deleted saved passwords and private certificate keys for users using a master password. Version 60.3.3 will prevent the loss of data; affected users who have already upgraded to version 60.3.2 or earlier can restore the deleted key3.db file from backup to complete the migration.
Fixed:
Address book search and auto-complete slowness introduced in Thunderbird 60.3.2
Plain text markup with * for bold, / for italics, _ for underline and | for code did not work when the enclosed text contained non-ASCII characters.
While composing a message, a link not removed when link location was removed in the link properties panel.

Known Issues
Unresolved:
Decoding problems for messages with less common charsets (cp932, cp936). This will be fixed in version 60.4.0.
CalDav access to some servers not working. Workaround: Set preference network.cookie.same-site.enabled to false.
Chat: Twitter not working due to API changes at Twitter.com

What’s New
Fixed:
Under some circumstances Thunderbird on Mac will send attachments using the so-called AppleDouble format which can lead to problems with mail servers and recipients.
Encoding problems when exporting address books or messages using the system charset. Messages are now always exported using the UTF-8 encoding.
If the "Date" header of a message was invalid, Jan 1970 or Dec 1969 was displayed. Now using date from "Received" header instead.
Body search/filtering didn't reliably ignore content of tags.
Inappropriate warning "Thunderbird prevented the site (addons.thunderbird.net) from asking you to install software on your computer" when installing add-ons.
Incorrect display of correspondents column since own email address was not always detected.
Spurious 
 (encoded newline) inserted into drafts and sent email.
New email not inserted in correct sort order in threaded unified view or search folder.

Known Issues
Unresolved:
CalDav access to some servers not working. Workaround: Set preference network.cookie.same-site.enabled to false.
Chat: Twitter not working due to API changes at Twitter.com

What’s New
Fixed:
Double-clicking on a word in the Write window sometimes launched the Advanced Property Editor or Link Properties dialog.
Cookie removal (not working since Thunderbird version 52).
"Download rest of message" not working if global inbox was used.
Encoding problems for users (especially in Poland) when a file was sent via a folder using "Sent to > Mail recipient" due to a problem in the Thunderbird MAPI interface.
According to RFC 4616 and RFC 5721, passwords containing non-ASCII characters are encoded using UTF-8 which can lead to problems with non-compliant providers, for example office365.com. The SMTP LOGIN and POP3 USER/PASS authentication methods are now using a Latin-1 encoding again to work around this issue.
Shutdown crash/hang after entering an empty IMAP password.

Known Issues
Unresolved:
Under some circumstances Thunderbird on Mac will send attachments using the so-called AppleDouble format which can lead to problems with mail servers and recipients.
CalDav access to some servers not working. Workaround: Set preference network.cookie.same-site.enabled to false.
Chat: Twitter not working due to API changes at Twitter.com (solution forthcoming).

What’s New

Changed:
ADD-ON SUPPORT: Restartless add-ons continue to work if their authors have made the necessary minor adjustments. Non-restartless legacy add-ons using XUL overlays are only supported if add-on authors have adapted them, and Lightning/Calendar is the only one we know that has been adapted.
Changed UI when installing add-ons. Restart required for legacy extensions.
Calendar: UI improvements for event dialog.

Fixed:
Print preview not working in Thunderbird version 63 beta.
Various Theme fixes where incorrect colors, backgrounds, etc. were displayed. Folders with new messages not shown in bold on Mac.
Add-on Options menu not working on Mac.
Shift+PageUp/PageDown in Write window.
Saving content of Write windows didn't overwrite existing file.
Issues related to "Edit Template" command.
Gloda attachment filtering.
S/MIME encryption/signing not working in Thunderbird version 63 beta.
Body search/filtering didn't reliably ignore content of tags.
Mails won't get removed from Trash folder using Maildir. Note: Other deletion issues related to Maildir still persist.
If the "Date" header of a message was invalid, Jan 1970 or Dec 1969 was displayed. Now using date from "Received" header instead.
Mailing list address auto-complete enter/return handling.
When sending of a message failed due a security issue, only "unknown error" was displayed. Now more details are given.
"Select All" in mail view not working in Thunderbird version 63 beta Beta 2.
Fixed in Thunderbird 64 beta 2.
According to RFC 4616 and RFC 5721, passwords containing non-ASCII characters are encoded using UTF-8 which can lead to problems with non-compliant providers, for example office365.com. The SMTP LOGIN and POP3 USER/PASS authentication methods are now using a Latin1 encoding again to work around this issue.
Cookie removal (not working since Thunderbird version 52). Note: Graphical feedback in the removal dialog is still not correct. This will be fixed in the next beta version.
"Download rest of message" not working if global inbox was used.
Shutdown crash/hang after entering an empty IMAP password.

Known Issues
Unresolved:
Double-clicking on a word in the Write window sometimes launches the Advanced Property Editor or Link Properties dialog.
Spellcheck marks disappeared erroneously for words with an apostrophe.
Editing a plaint text draft may display the entire message as quote (in blue).
Chat: Twitter not working due to API changes at Twitter.com (solution forthcoming).
Chat: Participants not sorted.

What’s New
Fixed:
Various Theme fixes where incorrect colors, backgrounds, etc. were displayed.
Add-on Options menu not working on Mac.
Shift+PageUp/PageDown in Write window.
Saving content of Write windows didn't overwrite existing file.
Issues related to "Edit Template" command.
Gloda attachment filtering.
Mailing list address auto-complete enter/return handling.
Thunderbird hung if HTML signature references non-existent image.
Filters not working for headers that appear more than once.
Various security fixes.

Known Issues
Unresolved:
According to RFC 5721, passwords containing non-ASCII characters are encoded using UTF-8 which can lead to problems with non-compliant providers, for example, office365.com
Double-clicking on a word in the Write window sometimes launches the Advanced Property Editor or Link Properties dialog.
CalDav access to some servers not working. Workaround: Set preference network.cookie.same-site.enabled to false.
Chat: Twitter not working due to API changes at Twitter.com (solution forthcoming).