Would it be possible to make a portable version of DavMail? It is a program to let Email clients besides Outlook take full advantage of Exchange servers by translating communications into POP, IMAP, Caldav, etc. I currently use it with my local installations of Thunderbird, but it would be nice if I could use it with my portable one, as well. The homepage can be found at http://davmail.sourceforge.net/, and I'm relatively certain it uses the GPLv2 License. I know that it requires Java, but, from what I understand, I don't think this will be an issue.