Forum Discussion
Microsoft 365 Minimal or Cutoff Migration?
- You can re-enable sync after the migration, that's not a problem. Do note that if you plan to decommission Exchange, having AAD Connect in the mix puts you in an unsupported configuration. Every configuration involving dirsync/AAD Connect requires you to keep at least one Exchange box for management purposes.
MSFT recommendation in currently described scenario is to go with https://bit.ly/2WUN6dH (minimal/express) migration as you won't have any problems related to synchronization and management. If your plan is to get rid of complete on prem-infrastructure, then cut over is the best choice because you got only 65 mailbox users. One of the requirements before starting cut over is to actually stop the directory synchronization (AAD Connect). Once migration is done, you can reconfigure the AADConnect. If you choose to go with Cut Over but still wants to keep the on Prem AD, then you need to manage some properties on daily basis via https://bit.ly/3AiJh0etools. Most common example is proxy address. As the source of authority is on prem AD, any change in proxy of M365 will be written over once synced.
