o365.ps

$user = "miken@sa4sp.com"
$pwd = ("****" | ConvertTo-SecureString -AsPlainText -Force)

$creds = New-Object  -TypeName System.Management.Automation.PSCredential `
           -ArgumentList $user, $pwd

$o365 = New-PSSession -ConfigurationName Microsoft.Exchange `
              -ConnectionUri "https://ps.outlook.com/powershell/" `
              -Credential $creds `
              -Authentication Basic `
              -AllowRedirection

Invoke-Command -Session $o365 `
               -ScriptBlock { 
                   Get-Mailbox | Get-MailboxStatistics | `
                   Select-Object `
                   DisplayName, IsArchiveMailbox, `
                   ItemCount, TotalItemSize} 

Remove-PSSession $o365