Hi Eddie,
I understand that you are not available to set up ADFS on your environment. You are wondering if you should turn off directory synchronization.
You do not need to delete users. If you’ve activated and installed the Microsoft Online Services Directory Synchronization tool, you can’t run a cutover Exchange Migration. Since you’ve installed the directory synchronization tool and activated it, you can deactivate directory synchronization and then run a cutover Exchange migration. For more information, see Manage directory synchronization.
You can also run the PowerShell cmdlet “Set-MsolDirSyncEnabled –EnableDirSync $false” to turn directory synchronization on or off for a company. To do so, you can refer the following steps:
1. Install the Local Windows PowerShell cmdlets. To do this, visit the following Microsoft website:
Use Windows PowerShell to manage Office 365
2. Start Microsoft Office Online Services Module for Windows PowerShell.
3. Disable directory synchronization. To do this, type the following cmdlet, and then press Enter:
Set-MsolDirSyncEnabled –EnableDirSync $false
4. Verify that directory synchronization was fully disabled by using the Windows PowerShell. To do this, run the following cmdlet periodically:
(Get-MSOLCompanyInformation).DirectorySynchronizationEnabled
This cmdlet will return True or False. Continue to run this cmdlet periodically until it returns False, and then go to the next step.
Note It may take 72 hours for deactivation to be completed. The time depends on the number of objects that are in your Office 365 subscription account.
5. Try to update an object by using Windows PowerShell or by using the Office 365 portal.
Note:
Step 4 may take a while to be completed. There is a process in the Microsoft Office 365 environment that computes attribute values. The process must be completed before the objects can be changed by using Windows PowerShell or by using the Office 365 portal.
For the detailed information, you can refer the article: Migrate All Mailboxes to the Cloud with a Cutover Exchange Migration.
Thanks,
Monica Tong
