It would be awesome to be able to use regular expressions, or at least some sort of wildcards, in searches and filters in Thunderbird. That would go for all text-based search criteria, so headers, message body, etc.
It would be very helpful to have an option to include subfolders when selecting folders to search in Thunderbird. For example, when searching for messages in an archive folder that preserves folder structure and is organized by year or by month, the ...
