Change the language of a Mailbox in Exchange 2007 upwards

Open the Exchange Powershell and type the following to view the language of the mailbox.
Get-Mailbox -Identity "Noel Pulis" | fl name, languages
Now, to change the language of the mailbox use the below, for example the code below will change my mailbox to English.
Set-Mailbox -Identity "Noel Pulis" -Languages "en-GB"