You can customize the directory details template to change the language of the Address Book. The language details templates show text provided by Microsoft Exchange Server (such as user properties in the Address Book) in the language on the Microsoft Outlook. Details templates for English, French, German, and Japanese are installed automatically. Installing language details templates does not affect server performance.
Note Templates are not replicated across site boundaries.
You also can customize the text shown in the display dialog box of the Address Book, such as the type of information stored in the directory and the format in which the information is displayed.
For more information about customizing details templates, see Microsoft Exchange Server Operations.