MobileMe: Fields within the MobileMe signup page do not accept Japanese characters in Safari
Symptoms
You may not be able to complete some text fields during the MobileMe sign-up process if you use Japanese language characters (such as names or Furigana / phonetic reading). This issue may occur when using Safari in Mac OS X.
Products Affected
Safari 3 (Mac OS X 10.4), Safari 3 (Mac OS X 10.5), Safari 4 (Mac OS X 10.5), Safari 4 (Mac OS X 10.4), MobileMe
Resolution
Update your browser to Safari 4.0.2 or later before sign-up.
Note: If you are unable to do so, or do not wish to update, you can use English alphabet characters during sign-up. You can change your information later (to Japanese characters) at the MobileMe account page.
Additional Information
To learn about other browsers that MobileMe supports, scroll down to the bottom of the MobileMe pricing page to view the MobileMe System Requirements.