365 - Export Legacy X500 to CSV

Open Powershell as an Administrator and process the following to connect to your 365 tenant:

$UserCredential = Get-Credential


Enter in 365 admin and credentials when prompted 

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic –AllowRedirection

Import-PSSession $Session

Export command 365:

Get-Mailbox | Select Name, PrimarySMTPAddress, legacyExchangeDN | Export-Csv C:\Source\Address\X500.csv -NoTypeInformation

 

Output will look similar to this:


With this output you can then modify as necessary for import into another AD or 365 tenant if doing a  tenant to tenant or other email migration and reduce unnecessary non-delivery errors.

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