Thunderbird for Mac

New

• Preview functionality for attachments on macOS.
• CMS message with AuthEnvelopedData can be decrypted properly in Thunderbird.
• Global search results can open in list view by default with new setting.
• "Copy To" folder context menu added for message/rfc822 attachments.
• Optional system tray mode that hides Thunderbird when the last window closes.
• Support for dragging message/rfc822 type MIME attachments to folder tree.
• Microsoft Graph enabled for Microsoft 365

Fixed

• Remote content warnings appeared despite sender block exceptions being applied.
• Collapsed saved-search folders did not deselect their subfolders.
• Server-designated special folder flags could be removed until restart.
• Messages could render excessive trailing blank lines.
• Copying a message subject included the "Subject:" label in copied text.
• Moving IMAP folders to Local Folders could delete messages after copy failures.
• 7-bit clean unobtrusive signature payloads were unnecessarily base64 encoded.
• DisablePasswordReveal policy failed to prevent revealing saved passwords.
• Account setup tried local-part usernames before full email addresses.
• Read-only CardDAV address books were incorrectly treated as writable.
• Autoscroll icon was missing directional arrows in scrollable messages.
• Blank 1970-dated messages could appear from incomplete message file copies.
• Thunderbird could crash when inserting a message header into database cache.
• IMAP repeatedly notified for messages already read on another device.
• Dragging EWS search folders to Trash caused Thunderbird to crash.
• Folder compaction displayed incorrect disk space recovery estimates.
• Custom OAuth settings for EWS account overwrote original account's settings.
• Thunderbird could crash when going offline with an active IMAP IDLE connection.
• Thunderbird could crash while running online mail search.
• Exchange accounts could show repeated false login failures during authentication.
• Expired newsgroup articles showed an insecure "click here" purge link.
• IMAP attachments appeared empty after messages were moved by filters.
• Default special-folder names could reference nonexistent server folders.
• Thunderbird macOS fell back to Software WebRender after GPU process launch failures.
• New RSS subscriptions used updated dates instead of published dates.
• Calendar sort order was not preserved across Thunderbird restarts.
• "All calendars are disabled" banner reappeared after enabling a calendar.
• Dismissed CalDAV reminders could permanently stop future event notifications.
• Read-only CardDAV calendars were incorrectly treated as writable.
• CalDAV sync failed when server responses used UTF-16 encoding.
• Visual and UX improvements.
• Security fixes.