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__AlexXx__'s avatar
__AlexXx__
Brass Contributor
Aug 07, 2024

Exchange Hybrid to Exchange Online - AD Sync enabled

Hi All,

I have a scenario with two redudants exchanges 2019 onprem and Office 365.

All mailboxes are hosted in cloud and we are using no smtp in onprem server.

 

Is there a known process to proceed with decomm of onprem server? Does the Microsoft cover this process?

Just did some researches and AD Sync could be a issue to proceed with this migration.

 

Thanks in advance

  • Hi,

    Since all your mailboxes are already in the cloud (Office 365), you don't need your on-premises Exchange servers anymore.

    If you're using Azure AD Sync (which synchronizes your on-premises Active Directory with Azure Active Directory), you might need to keep one Exchange server on-premises. This is because Azure AD Sync uses the on-premises Exchange server to manage some things.

    Make sure all your emails are flowing through Office 365 and not through your on-premises Exchange servers. You can get rid of most of your on-premises Exchange servers, but... If you need to keep Azure AD Sync, you should keep one Exchange server on-premises. This will help with management and resource conservation.

    Thanks
  • Ankit's avatar
    Ankit
    Brass Contributor
    Hi,

    Since all your mailboxes are already in the cloud (Office 365), you don't need your on-premises Exchange servers anymore.

    If you're using Azure AD Sync (which synchronizes your on-premises Active Directory with Azure Active Directory), you might need to keep one Exchange server on-premises. This is because Azure AD Sync uses the on-premises Exchange server to manage some things.

    Make sure all your emails are flowing through Office 365 and not through your on-premises Exchange servers. You can get rid of most of your on-premises Exchange servers, but... If you need to keep Azure AD Sync, you should keep one Exchange server on-premises. This will help with management and resource conservation.

    Thanks

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