1)   Email Commander 8.60
E-mail Commander is a portable email client that does not require any kind of formal installation onto a computer's permanent storage device to be executed, and can be stored on a removable storage device such as a USB flash drive (see usbspace.com)

 2)   Mercury Document system 1.9.1
A personal document management (PDM) / personal knowledge management (PKM) application for Microsoft Windows. With an extremely simple layout, it helps you manage and securely store all of your electronic documents. And it is portable.