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Dzung Vu's avatar
Dzung Vu
Copper Contributor
Apr 28, 2026

Hybrid Exchange 2019 move to M365

Dear All,

I am asked to move/ migrate the existing Hybrid Exchange to M365.

All mailboxes are located in M365.

MX Record is pointing to the third-party spam filtering company which we are not too sure either stay with them or not.

My next concern is the Send and Receive connectors.

has any one of you done similar task like this? any help or document/ link would be much appreciated.

 

Regards

Exchange Server
hybrid

3 Replies

  • T-C-M's avatar
    T-C-M
    Copper Contributor
    Apr 30, 2026

    If all your mailboxes already are in EXO, I guess what you may want to do is to break and remove the Hybrid configuration? First step here would be to move the Exchange attributes SOA from AD to EXO, explained in 

    https://learn.microsoft.com/en-us/exchange/hybrid-deployment/enable-exchange-attributes-cloud-management

    You want to enable IsExchangeCloudManaged in tenant to cover all new mailboxes created. Then set IsExchangeCloudManaged to True for all other mailboxes. 

    Please carefully read the documentations as there are considerations to be made.

  • Dzung Vu's avatar
    Dzung Vu
    Copper Contributor
    Apr 29, 2026

    Hi AnnTaeYoun​ 

    Thanks for the help and link, I am reading to see if viable for our sitiuation.

    what about other connectors? how could I point to M365?

    One thing I should have mentioned earlier is that the hybrid box I currently use SMTP relay as well.

    Thanks again
    Regards