Windows 8, Windows Server 2012 allow IME input state to be different for each application
In Windows 8 and Windows Server 2012, for some reason, the input state of the IME (alphanumeric input, hiragana input, etc.) is in the form that the entire OS has. For example, if you move the text box of App A to the hiragana input state, and move the focus to the text box of App B, it is still in the hiragana input state.
It may be easier to use for new users, but earlier OSes have an IME input state for each application by default, so it may be difficult for some people to use.
To have an IME input state for each application, follow these steps: Windows 8, Windows Server 2012 and later OS settings.
Move the mouse to the upper-right or lower-right corner of the desktop to display the charms. Select Settings from the menu.
From the Settings menu, choose Control Panel.
From Control Panel, select Clock, Language, and Region.
Check "Set different input methods for each app window" from "Switch input methods" and click the Save button.