The language of the Outlook user interface that an Outlook user sees, including the content generated by Exchange, depends on the following:

• The language the user is using in Outlook
  
  
• Whether the language they're using in Outlook is supported by Exchange 2010
  
  
• Whether the language they're using in Outlook has been configured to be available on the Exchange 2010 server
  
  

Consider the following scenarios:

• When an Outlook user who's set their language to <Language A> signs in to their Exchange 2010 mailbox and both Outlook and Exchange 2010 support the language the user has specified, <Language A>, the user will see all messages and Exchange-generated mailbox components, for example, the Inbox, in Language A.
  
  
• When an Outlook user who's set their language to <Language A> signs in to their Exchange 2010 mailbox that's been set to <Language B>, the Outlook user will see the Outlook user interface in Language A, but will see the content generated by Exchange. For example, by default, folder names such as Inbox, Deleted Items, and Sent Items display in <Language B>.
  
  

You can change the Exchange mailbox language setting on the server using Exchange Management Console or the Exchange Management Shell. For information about how to use the Shell to change the language setting for a mailbox on a server, see Set-MailboxRegionalConfiguration.

The following table includes information about the languages that are supported for client and administrative features in Exchange 2010.

Supported languages for Exchange Server 2010