Cutover to Exchange 2019 from hybrid Exchange 2013-Office 365 with no downtime?

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    • #1555299
      IT Engineer
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      Hi People,

      I’m running Hybrid Exchange 2013 SP1 CU15 (Windows Server 2012R2) and Office 365.
      Azure AD connect is used to sync the On-premise  AD user to the cloud one way up.

      There is no more mailboxes on-premises, all has been migrated to Office 365.

      I need some help and advice in cutting over the existing 2x CAS server that is now running with the namespace to the new 3x CAS servers running
      Windows Server 2016 and Exchange 2019 CU4.

      What’s the steps and the procedure to avoid the email flow and minimize down time for the users?
      do I need to change both Internal and External the to

      Thank you in advance.

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