How to disable the "create an Exchange mailbox" option to all Active Directory Account Template
Identity Manager 14.x
To change a specific Account Template change the '<Account-Template-Name>' to your account Template name.
If would like to run it to All Account Templates, change the '<Account-Template-Name>' to '*'
etautil -u etaadmin -p <etaadmin´s Password> masschange 'eTADSPolicyContainerName=Active Directory Policies,eTNamespaceName=CommonObjects' eTADSPolicy eTADSPolicyName='<Account-Template-Name>' to eTADShomeMDB="" eTADShomeMTA="" eTADSmailNickname="" eTADSmDBUseDefaults=""