I am now working with a new company that will be sending me back and forth to Japan on a regular basis, not a huge deal with cell phones because I will be setting up an account in Japan as well and just keeping it for the times when I am over there since we are on different systems.

The question is, what PDA phone here in the US can run a Japanese operating system, such as Japanese version of windows mobile etc? Most of my emails are in Japanese characters so it would need to be able to handle that, and if the whole operating system was in Japanese the better.

Any phone suggestions or links that might be helpful would be appreciated.