Removing Set Values from a String in PowerShell cmdlet

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I am trying to return Emails from an Exchange server but only with the username. For example, I want the value 'jdoe@example.com' to be returned as just 'jdoe'.

What I have is this:

Get-Mailbox -ResultSize unlimited | Select-Object DisplayName, PrimarySmtpAddress | Sort-Object PrimarySmtpAddress | Out-GridView

The other option is to be able to change First Name and Last Name to First Initial and Last Name. For example, Change 'John Doe' to 'jdoe'.



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