Requirements: Windows XP / Vista / Windows 7 / XP 64-bit / Vista 64-bit / Windows 7 64-bit / Windows 8 / Windows 8 64-bit / Windows 10 / Windows 10 64-bit
New: When composing a message, attachments can now be reordered. Calendar: Allow email scheduling for CalDAV servers supporting server-side scheduling. Thunderbird Chat now contains multiple built-in message themes. Changed: Thunderbird Chat: Nicknames inside of messages are colored to match the participants list. Fixed: Searching message bodies of messages in local folders, including filter and quick filter operations, not working reliably: Content not found in base64-encode message parts, non-ASCII text not found and false positives found. Defective messages (without at least one expected header) not shown in IMAP folders but shown on mobile devices. Better error handling for Yahoo accounts. Outlook import. Performance problem when repairing, rebuilding or compacting folders or accessing large folders. Localised versions of Thunderbird didn't show a localised name for Hotmail's "Deleted" folder. Calendar: Unintended task deletion if numlock is enabled. Calendar: Can't copy information from event dialog for received invitations.