We are in the process of migrating from Exchange 2007 to 2013. In 2007 nobody had the ability to change their profile picture (seen in Outlook and in our online phonebook). However, it would appear that users already migrated to 2013 who have a iOS device connected via ActiveSync can now use the OWA for iPhone mail client on their mobile to change their profile picture.
We do not want users to have this ability, we have already seen some inappropriate images appear and need to stop this. How can I restrict it?