#Add Exchange 2010 Powershell Commands, run the Exchange scripts and connect to the environment
add-pssnapin Microsoft.Exchange.Management.PowerShell.E2010
. 'C:\Program Files\Microsoft\Exchange Server\V14\bin\RemoteExchange.ps1'
Connect-ExchangeServer -auto

#IT department test, in the future all that would need to be edited is the $ITManager variable for whomever this needs to go to"

$ITManager = "IT Manager Mailbox Name"
$CompanyName = "Name of Company"

#Get the actual IT Manager's mailbox and set the variable for the primary SMTP Address (this script wouldn't work otherwise)
$ITManagerMailbox = get-mailbox -Identity $ITManager
$ITSmtp = $ITManagerMailbox.primarysmtpaddress

#Set the forwarding, then set the auto reply.  We can add an internal message too if needed
get-mailbox -OrganizationalUnit "PathToOUContainingOldUserMailboxes" | Set-Mailbox -DeliverToMailboxAndForward $true -ForwardingAddress $ITManagerMailbox.Identity
get-mailbox -OrganizationalUnit "PathToOUContainingOldUserMailboxes" | Set-MailboxAutoReplyConfiguration -AutoReplyState Enabled -ExternalAudience all -ExternalMessage "Hi! I am no longer with $CompanyName.  Please update your contacts to send e-mail to my manager $ITManager at $ITSmtp"