I migrated my thunderbird to a new laptop a few weeks back. Since then, the auto-completion in the address line isn't working: Typing is red, no suggestions are shown. Autocomplete is enabled in "options". Address book has been imported/migrated and addresses show up in address book, looks alright. What can I do to find the problem? It is very very annoying and tiring to always have to look for the correct addresses and copy them, especially when directing mails to several recipients.