Changing The Default Email Address In Office 365

Not SQL related today but a good example of PowerShell in action.

I recently migrated my personal email over to Office 365 from Microsoft. The migration itself went very smoothly but I ran into an issue where the primary email address on the account was showing with a address instead of This seriously bugged me and I couldn’t find a way to change it in the Office 365 admin interface.

After some digging I found that you could only make a change such as this using PowerShell, and that you couldn’t do it using the account you want to change (makes sense).

So I created a new admin account just for the purpose and initiated a session in Office 365 (entering the admin users credentials when prompted)

$Livecred = get-credential

$Session = new-pssession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $Livecred -Authentication Basic -AllowRedirection

Import-PSSession $Session

Now I had to find the account, easy enough:

get-mailbox | where-object {$_.Identity -eq "<my account>"} | fl

This gave me all the details, including the PrimarySmtpAddress


As you can see from the membership properties you can get and set this information, so that’s what I went to do:

set-mailbox <my account> -PrimarySmtpAddress <my account>

And got an error

A positional parameter cannot be found that accepts argument ‘-PrimarySmtpAddress’.
    + CategoryInfo          : InvalidArgument: (:) [Set-Mailbox], ParameterBindingException
    + FullyQualifiedErrorId : PositionalParameterNotFound,Set-Mailbox


Well this made no sense. No matter what I tried I could not do anything other than a get on the PrimarySmtpAddress. Back to the searching and I discovered that Microsoft have not provided the capability to run a set on that particular member object in Office 365 (although it’s available with Exchange). Way to do with that Microsoft.

After some more digging I was able to get the SMTP address changed by setting the WindowsEmailAddress to the correct value

set-mailbox <my account> -WindowsEmailAddress <my account>


One other note, when using PowerShell to manage O365 and it says to use Identity use the Alias for the account instead or you might up with unintended consequences.

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