bulk import user. using Title string.

going to bulk import user, but PS said title cannot be found?  See below error and my screenshot:

[PS] C:\temp>Import-CSV test_bulk.csv | foreach {new-mailbox -firstname $_.firstname -lastname $_.lastname -Name $_.name
 -Alias $_.alias -UserPrincipalName $_.userprincipalname -Title $_.Title -OrganizationalUnit $_.organizationalunit -pass
word(ConvertTo-SecureString $_.password -AsPlainText -force) -ResetPasswordOnNextLogon $true}

A parameter cannot be found that matches parameter name 'Title'.
    + CategoryInfo          : InvalidArgument: (:) [New-Mailbox], ParameterBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,New-Mailbox

link to screen shot :

http://i247.photobucket.com/albums/gg126/lackof2/exhcangetitle.jpg