Exchange Hybrid Deployment scenario across different AD domains? RRS feed

  • Question

  • Hey Guys, 

    We have a bit tricky Office 365 Exchange Hybrid deployment scenario. The question is, whether Exchange Hybrid deployment works across different Active Directory domains?


    1. Our on premises Exchange ( is connected to an AD (contoso.local). So, the user’s email address is “”, but his domain account is “username@contoso.local”.
    2. We migrated the user to a new on premises AD (, and setup AD Sync with Office 365. So that the user’s new domain account is “”.
    3. Now, we need a hybrid Exchange setup between Office 365 (which is in sync with new AD domain) and on premises Exchange (which is connected to contoso.local AD domain). Note that the email addresses are same (

    Will this work? Has anyone come across a similar scenario?

    Thanks & Regards,


    Wednesday, March 2, 2016 11:54 PM


  • Hi Amal,

    According to your description, the issue is related to Exchange Hybrid Deployment. This forum focuses on some general discussion about Office 365 ProPlus which is the version of Office that comes with many Office 365 plans. Therefore, I suggest we can post the issue in Microsoft Exchange Online (Office 365) forum for more professional suggestions:

    The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.


    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact

    Winnie Liang
    TechNet Community Support

    Thursday, March 3, 2016 9:37 AM

All replies