Cryptainer PPC is an easy to use encryption software for your Pocket PC. Based on the award winning Cryptainer LE, it creates an encrypted 'storage card', which keeps all your important data safe. You can load/unload this storage card anytime you require.
More information on Cryptainer PPC can be found here
There is a known issue with external cards. At the moment, Cryptainer PPC does not support external memory cards. A version supporting such cards will be released shortly.
In any event, if you were to remove the external card, Cryptainer will work smoothly.
Cryptainer PPC works on Windows Mobile 5.0, Pocket PC 2002, 2003, 2003 SE