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After I cutover migrate all mailboxes to exchange online (before I change the DNS MX and A records "Autodiscover") >>> Is my on prem exchange 2016 Server are still available to users????

Background

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On prem to Azure Ad sync ----ok

AD Users already sync to Azure AD---ok

Planning not to use hybrid exchange because of future email attributes control difficulty.


I found that the cutover mailbox migration grey out, I can't use cutover migrate. After I turn off Azure Dirsync, the cutover migration is available now from class Exchange Admin Center and I successfully created mailbox migration batch.


Currently, the Public DNS is still pointing to the on prem exchange 2016 Server.  


I am in the step of evaluating the Exchange online.


After I cutover migrate all mailboxes to exchange online (before I change the DNS MX and A records "Autodiscover") >>> Is my on prem exchange 2016 Server are still available to users????


 



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