Disable Exchange Server Intergration on Windows Server Essentials 2012 R2

Hi There

I have a Essentials 2012 R2 that is running a Hyper-V box with Exchange Server 2013. The previous version of the Exchange Server 2013 did not work and became unusable. So my question is, is there a command to disable this or a way to find the new ExchangeManagementAccount as this is the only value of three that the server seems to store to intergrade. At HKEY_LOCAL_MACHINE\SOFTWARE\Mircosoft\Windows Server\Productivity\OPEIntegration\Configuration

Thanks