Migrated Thunderbird from Windows 7 to Windows 10, all working properly but no dates show in "Date" or "Received" columns. Time shows in those columns for today's emails. About:config entries didn't exist for mail.ui.display.dateformat.thisweek or mail.ui.display.dateformat.default entries, I added both but with no effect, perhaps these are obsolete? Tried "folder repair" with no effect. Tried add on "date format" with no effect. POP server being used. Thanks for any help.