Exchange 2010 Outlook Wep App (OWA) Changing the Default Spelling Dictionary

It Seems that in Exchange 2010 RTM & SP1 Outlook Web App (OWA). That the default Dictionary Reverts to English United States, Regardless of the CAS Server Language, Client Browser Language etc.

So, How do we change this for multiple or all users users ?
Answer
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Using Powershell and MailboxSpellingConfiguration Applet command:

1. First lets check the current Dictionary setting for a Particular user,
    we will use:
 Get-MailboxSpellingConfiguration -identity usernamehere

This will present the following output. as can be seen, We have the wrong Dictionary..!

RunspaceId         : 9e7c7fdb-137d-45ac-b04b-71f74eb2e643
CheckBeforeSend    : False
DictionaryLanguage : EnglishUnitedSates
IgnoreUppercase    : False
IgnoreMixedDigits  : False
Identity           :
IsValid            : True

2. Now lets go about setting the Dictionary to our preferred Dictionary.
   So for ALL users the following command will be sufficient.

Get-Mailbox | set-MailboxSpellingConfiguration -DictionaryLanguage EnglishUnitedKingdom

 for a single user we would simply run:
set-MailboxSpellingConfiguration -identity username -DictionaryLanguage EnglishUnitedKingdom


 Running the Above PS Command will confirm the change on a user
Get-MailboxSpellingConfiguration -identity usernamehere
RunspaceId         : 9e7c7fdb-137d-45ac-b04b-71f74eb2e643
CheckBeforeSend    : False
DictionaryLanguage : EnglishUnitedKingdom
IgnoreUppercase    : False
IgnoreMixedDigits  : False
Identity           :
IsValid            : True