$0.00 - Server
$0.00 - Licensing and renewal
$0.00 - Support and downtime (we also offer free tech support)
$9.95 / mailbox * 20 = $199.00 / month
$199.00 / month * 12 =

$2,388 / year for world class messaging with OnePointSync.

$4,500 - Server (allowance of $900 / year since server life span is approx 5 years)
$480 - Licensing and renewal
$7,500 - Support and downtime (rate used = $125 / hour, at approx 5 hours / month, not to mention possible loss of business due to downtime and bounces.)

$8,880 / year to support your own in house mail server.