Exchange 2013 and uploading photos

Does anyone know how to prevent users from loading their own photos in Exchange 2013?
We have standard staff photos that are uploaded through the AD to our exchange server so that a member of staffs photo is visible when using Outlook.
However members of staff have been able to upload their own photo and use it instead. We used to be able to lock it when we used Exchange 2003/2010...
I can search the internet for an answer, but I though I would try this first.
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AmitIT ArchitectCommented:
Just need to run PS command to disable it. Follow this kb

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