title: Mailbox doesn't exit with Get-MailboxFolder but exist with Get-Mailbox
body: <p>When I type the command :</p>
  
  <blockquote>
    <p>Get-Mailbox "user"</p>
  </blockquote>
  
  <p>It returns the mailbox of "user" without problem but when I want to access the folders of "user" with :</p>
  
  <blockquote>
    <p>Get-MailboxFolder "user"</p>
  </blockquote>
  
  <p>I have this error message : "The specified mailbox doesn't exist".</p>
  
  <p>I specify that I have full access on the "user"'s mailbox.</p>