I use Thunderbird portable on my usb flash drive at uni and everywhere else. Privacy of email is absolutely important to protect against identity theft. Portable Thunderbird is a beautiful portable app with some really great features except for the one I need the most, and that is a password protection feature. Before accessing any emails, there needs to be a requirement to enter the correct password. I've heard some arguments that users should instead rely on user accounts within the operating system, but this is hardly relevant for a portable app since you often would not be using your own computer. Another argument is that password protection may not be a very secure type of protection, however I think most people are not hackers and most people also would not be interested enough to try and get around the password. I think the protection is mostly useful to guard against casual or amateur prying rather than professional hacking. However, even the most simple password protection has not been included in Thunderbird to my knowledge. Is there anyone else who is interested in this feature?