We have two plants connected by a T1. Both have MSExchange with fail over clustering. Both have internet from an separate isp source. This was done so that in the event of a server crash at one site the email system would continued to operated for both sites. Yesterday the T1 failed so both MSExchange servers dismounted their databases. No one had email. We were able to create a VPN between the two plants and get things back up. What can be done in the future to prevent the scenario of the T1 going and one plant losing it's internet, rendering both emails servers inoperable.