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    15 comments  ·  General » Users, Photos, Contacts  ·  Flag idea as inappropriate…  ·  Admin →
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    J.Bunne commented  · 

    Hello, you have probably found your own solution for this issue by now. But for anyone else having this problem I solved it but using the following command in Powershell:

    #This value for "MicrosoftOnlineServicesID" is the value of the MailBox property "WindowsLiveID"
    #We want to change this to our secondary domain to enable the removal of the default primary domain smtp alias

    Set-Mailbox -MicrosoftOnlineServicesID
    "WARNING: UserPrincipalName "" should be same as WindowsLiveID "", UserPrincipalName should remain as"".

    #Ignore the warning and now we can remove the smtp alias
    Set-Mailbox -EmailAddresses @{remove=""}

    #Confirm the removal by issuing this command
    Get-Recipient | Select Name, EmailAddresses

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