Our firm is using O365. I need to find a way to restrict users from being able to export their messages to a PST. I have seen several methods online which describe a way to accomplish this by modifying registry entries. One method uses a key to disable PST creation, while another method uses a key to disable the import/export button. I have tried these methods but have been unable to get them to work. The Outlook version that I am using reads 'Outlook 365 Apps for Enterprise' 'Version 2007 Build 13029.20308'. Has anyone been able to successfully restrict users from creating PSTs? I would prefer a method that allows me to test this without using a GPO first.