Seaside Software's XKey. I've just seen another plug for this product, so I thought it worthy of a mention here. Xkey securely stores all of your Exchange data and the application logic to execute it – on a key that fits in the palm of your hand. With Xkey you can load your Exchange data on any USB-equipped PC and run online/offline it through a simple web browser – instantly, without any new server or client software installation or configuration!
* Plug your Exchange mailbox into any USB-compatible PC or thin-client
* Plug 'n work-no software or configuration required
* Grab 'n go-leaves no trace on host PC
* Strong encryption protects unauthorized access in case of loss