Release Notes

Implemented enterprise policy to allow granular in-app notification control

Added 'Mark as Read' and 'Delete' actions to mail notifications

Implemented customizable row count for Cards View in 'Appearance' settings

Implemented ability to manually sort folders in the folder pane

Thunderbird could crash when setting message compose headers

Links in the OAuth authentication window did not open when clicked

Access was not allowed to attachments at specific UNC hosts

Mail window could stop functioning during and after folder compaction

Full folder sorting logic was not used when inserting folders after move

mail.compose.other.header headers were not shown in Show All Headers mode

Folder was hidden from Favorite when a subfolder was removed

Folder tree message counts displayed incorrectly under certain conditions

Selection was not restored after manual folder sorting

Dragging a folder to a new parent did not insert it correctly for IMAP folders

Compact View users had all folders expanded after restart

Invite attachments without a name were forwarded as 'Attached Message Part'

Chat settings tab remained visible when mail.chat.enabled was false

Selected folder was not refreshed when applying 'Appearance' Threading settings

'Grouped by Sort' for all folders in 'Appearance' settings did not work properly

Thunderbird could crash if message copying to Sent folder was interrupted

System search toggle did not properly reflect and control integration state

Dragging attachments to desktop from Thunderbird did not work on macOS

Dark mode messages displayed in light mode due to preference setting conflict

Cancelling a post to a news server could fail and remove the article

Thunderbird could crash in NNTP subscription dialog

Newsgroup searches with slashes were not supported with XPAT-enabled servers

Offline newsgroup use lacked functionality needed for effective offline access

Chat accounts could not be deleted

Reminders missed for all-day events when calendar.alarms.showmissed was false

Access to multiple CalDAV calendars was not possible

Visual and UX improvements

Security fixes

Message list switched to Cards View instead of keeping Table View preference