How to create (or recreate) an Edge Subscription in Exchange 2007
The following directions are for EBS 2008, but will work for any 2-server Exchange 2007 deployment:
Security (Edge) Server
1. From Exchange Management Shell, enter the following command:
a. New-EdgeSubscription -FileName "c:\windows\temp\EdgeSubscriptionInfo.xml"
2. Copy “c:\windows\temp\EdgeSubscriptoinInfo.xml” to the Messaging server
Messaging Server
1. Open the Exchange Management Console.
a. Expand Organization Configuration
b. Select Hub Transport
c. In the result pane, click the Edge Subscriptions tab.
2. In the action pane, click New Edge Subscription. The New Edge Subscription Wizard starts.
3. On the New Edge Subscription page, in the Active Directory Site: drop-down list, select an Active Directory site.
4. On the New Edge Subscription page, click Browse. Locate the Edge Subscription file to import. Select the file, and then click Open.
5. On the New Edge Subscription page, click New.
6. On the Completion page, click Finish.
7. Open elevated Exchange Management Shell instance and run the command:
a. start-edgesynchronization (or restart the Microsoft EdgeSync service in the Services console.)