Mail App issues

Hi,

The whole mail app is still quite confusing to me...

I have a customer, he installed EV with SSL from the beginning so we're good on this point.

we run the script on the IT guy user:

$Mbx = get-mailbox "igor"
New-App -mailbox $Mbx.LegacyExchangeDN -Url `
("http://EV_server/EnterpriseVault/OfficeMailAppManifest.aspx?LegacyMbxDn=" +
$Mbx.LegacyExchangeDN)

I'ts working internally through OWA only, when opening in outlook we receive: "APP ERROR this app could not be started"

Any ideas?

Also, the customer has a Check Point FW, we want the Mail App to be available from OWA outside the organization, can you please help me understand what do we need to publish?

Thanks,

Sarah