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Calendar: Task and Event tree colours adjusted for the dark theme
Retrieval of S/MIME certificates from LDAP failed
Address-parsing crash on some IMAP servers when preference mail.imap.use_envelope_cmd was set
Incorrect forwarding of HTML messages caused SMTP servers to respond with a timeout
Calendar: Various parts of the calendar UI stopped working when a second Thunderbird window opened
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.