Missingfeature to open password protected attachments after entering the right password.
Yahoo is the only email service I know of which says, password protected attachments cannot be open. In all other emails, it gives users a prompt to enter password of the pdf file which has come in email attachments and if entered correctly, then it opens the pdf and you can view them easily.
It is very useful when checking bank statements. Downloading is unsafe if you are on public computers. Checking online helps keep these documents secure.
Hope Yahoo will develop these soon. Thank you.