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    Performed several migrations in the past using a 3rd party tool, this time the mailboxes are migrated using a hybrid configuration. The migration itself went perfectly, the next step is to uninstall the on-premise Exchange servers.
    All mailboxes that are migrated are now remote mailboxes, the question is: what will happen if Exchange is deinstalled? Will it remove the values for the attributes smtpproxyaddress, emailadres, x400? or will it leave those in place?

    Please no discussion that removing the Exchange server is a bad idea, well aware of consequences. 
    • Edited by Marc-1983 Tuesday, June 20, 2017 3:17 PM
    Tuesday, June 20, 2017 3:16 PM

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    Nothing is removed, You just lose the management piece which could be done using ADSIEDIT which is unsupported of-course.

    Regards,

    Fazal

    Disclaimer: The views expressed on this blog are my own and do not necessarily reflect the views of my employer.

    • Proposed as answer by Niko.Cheng Wednesday, June 21, 2017 8:11 AM
    • Marked as answer by Marc-1983 Thursday, June 22, 2017 8:05 PM
    Tuesday, June 20, 2017 6:03 PM
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    Hi Bruun,

    Agree with Fazal. Decommission the on-premise Exchange servers will not remove anything in cloud mailbox, however, as most of the attributes cannot be managed from Exchange Online and must be managed from on-premises, if you decommission the on-premise Exchange servers, you will discover that you can no longer manage your cloud mailboxes.

    Details see : How and when to decommission your on-premises Exchange servers in a hybrid deployment

    Best Regards,

    Niko Cheng
    TechNet Community Support


    Please remember to mark the replies as answers.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by Marc-1983 Thursday, June 22, 2017 8:06 PM
    Wednesday, June 21, 2017 8:23 AM

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    Nothing is removed, You just lose the management piece which could be done using ADSIEDIT which is unsupported of-course.

    Regards,

    Fazal

    Disclaimer: The views expressed on this blog are my own and do not necessarily reflect the views of my employer.

    • Proposed as answer by Niko.Cheng Wednesday, June 21, 2017 8:11 AM
    • Marked as answer by Marc-1983 Thursday, June 22, 2017 8:05 PM
    Tuesday, June 20, 2017 6:03 PM
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    Hi Bruun,

    Agree with Fazal. Decommission the on-premise Exchange servers will not remove anything in cloud mailbox, however, as most of the attributes cannot be managed from Exchange Online and must be managed from on-premises, if you decommission the on-premise Exchange servers, you will discover that you can no longer manage your cloud mailboxes.

    Details see : How and when to decommission your on-premises Exchange servers in a hybrid deployment

    Best Regards,

    Niko Cheng
    TechNet Community Support


    Please remember to mark the replies as answers.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by Marc-1983 Thursday, June 22, 2017 8:06 PM
    Wednesday, June 21, 2017 8:23 AM