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
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.
Known Issues Unresolved: 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.
October 29, 2018 
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