You can configure three language settings for Outlook Web App.

• The sign-in and error language setting applies to individual Outlook Web App virtual directories. The sign-in and error language is the language that will be used for errors and the forms-based authentication sign-in page. If a value isn't set for this language, the default value is 0. This means that the default sign-in and error language isn't defined. If the sign-in and error language isn't defined, Outlook Web App will default first to the language set on the Web browser on the client computer. If the language set on the Web browser on the client computer isn't supported by Outlook Web App, Outlook Web App will use the language of the Client Access server.
  
  
• The default client language setting applies to individual Outlook Web App virtual directories. The default client language is the client language that's used by Outlook Web App unless the user uses Regional Settings in Outlook Web App to change the language and time zone. The default value for this setting is 0. This means the default client language isn't defined. If the default client language isn't defined, users will be prompted to choose a language and time zone the first time that they sign in to Outlook Web App. If the default client language value is defined, users won't be prompted to choose a language and the Outlook Web App time zone will use the time zone of the Client Access server. Defining the default client language causes the default folders to be renamed based on the specified language. Users can change the client language and time zone by using Regional Settings in Outlook Web App and can rename the default folders after they sign in.
  
  
• The client languages are set on individual mailboxes and affect the language that's used in Outlook and Outlook Web App. If multiple languages are configured, the first language in the list that's supported by the Web browser will be used. If none of the languages in the default languages list are supported by the Web browser, the Client Access server language will be used.
  
  
• To support labels such as To and From in languages other than English, the appropriate language pack must be installed on the Client Access server and the Mailbox server.
  
  

Looking for other advanced management tasks for Outlook Web App? Check out Managing Outlook Web App Advanced Features.

Note:
For all Arabic, Hebrew, and Urdu text to be displayed correctly in Outlook Web App, support for languages that are read from right-to-left and for script languages must be installed on the client computer. Asian languages might also require that the East Asian language support be installed on the client computer.

The following table lists the languages and locales that can be configured in the Shell, and their associated codes.

Available languages and locales and their associated codes

1. Use a Web browser to sign in to a mailbox that you have full access permission to via Outlook Web App.
   
   
2. Click Options, and then click Regional Settings.
   
   
3. Under Language, in the Choose language list, click the language that you want to use.
   
   

   Note:
   The language that you select will determine the date and time settings in the Date and Time Formats section.

4. Click Save to save your language settings.
   
   

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Outlook Web App virtual directories" entry in the Client Access Permissions topic.

Use the Shell to configure the sign-in and error language settings for Outlook Web App

This example sets the sign-in and error language setting.

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Set-OwaVirtualDirectory -identity "Owa (Default Web Site)" -LogonAndErrorLanguage <language code>

Use the Shell to configure the default client language setting for an Outlook Web App virtual directory

This example sets the default client language setting.

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Set-MailboxRegionalConfiguration -Identity <Username> -Language <language code>

Use the Shell to configure the client language setting for an individual mailbox

This example sets the client languages setting for an individual mailbox.

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Set-Mailbox -identity <mailbox identity> -languages <language code>

For more information about syntax and parameters, see Set-OwaVirtualDirectory and Set-Mailbox.

After you configure language settings, you may also want to Configure Character Settings for Outlook Web App.