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In dark theme unread messages no longer shown in blue to distinguish from tagged messages
Account setup is now using client side DNS MX lookup instead of relying on a server.
Searching LDAP address book crashed in some circumstances
Message navigation with backward and forward buttons did not work in some circumstances
WebExtension toolbar icons were displayed too small
Calendar: Tasks due today were not listed in bold
Calendar: Last day of long-running events was not shown
When upgrading from Thunderbird version 60 to version 68, add-ons are not automatically updated during the upgrade process. They will however be updated during the add-on update check. It is of course possible to reinstall compatible add-ons via the Add-ons Manager or via addons.thunderbird.net.