Conectarse a la cuenta desde powershell:
$UserCredential = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session -DisableNameChecking HABILITAR EXPANSIÓN AUTOMÁTICA DE ARCHIVADO: Enable-Mailbox <user mailbox> -AutoExpandingArchive COMPROBAR QUE ESTA ACTIVADO, TIENE QUE DEVOLVER TRUE: Get-Mailbox <user mailbox> | FL AutoExpandingArchiveEnabled