Hello,
We are migrating our on premise Exchange2013 mailboxes to O365. Exchange 2013 (SP4) is installed on our single Windows 2012 R2 Domain Controller. Once the MX records are cutover to O365, and we are satisfied all mail is migrated, etc., we no longer will need Exchange on the DC and would most likely on install it. We need direction on:
1. Prior to uninstalling it, what services, settings etc. should we disable/change so that no new mail, either internal or external, goes into the Exchange mailboxes.
2. We are particular concerned about the internal email usage and will be instructing users to use external email addresses only. so please be specific on how to disable this ability.
3. Have read steps on uninstalling Exchange but nothing particular about when it is on a Domain Controller?