Powershell Check to see if mailbox exists

Scenario:  You have a list of mailboxes that you do not know if they still exist or not.  Instead of checking one by one, you can script this.  

In my users.csv I have a header with Name that contains all of the aliases underneath.

$users = Import-csv C:\users.csv
$users | ForEach { $exist = [bool](Get-mailbox $_.name -erroraction SilentlyContinue); Write-host "$Exist $_.Name"}