My private collection of articles found on the net, i dont own them but they helped me.: How to re-subscribe your Exchange 2007 EdgeTransport Server

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How to re-subscribe your Exchange 2007 EdgeTransport Server

- after renew self-sign certificate on edge you have to re-subscribe edge sync in following:

How to re-subscribe your Edge Transport Server

1.	Remove Old Edge Subscription From your exchange management console on the hub transport server under organization configuration click the Edge Subscriptions tab. Right click the current edge subscription and click remove.
2.	Create New subscription Go to the edge server and open the Exchange Management Shell type: "New-EdgeSubscription" it will then ask for filename type the file path and desired name of your xml file it will generate. e.g. c:\EdgeSubscription.xml
3.	Copy .xml file to the Hub Server Copy the recently created subscription file to the Exchange Server where the Hub Transport server is installed.
4.	Install the new subscription file Under Organization Configuration on the Hub Transport click the Edge Subscriptions tab. Under the Actions Panel click "New Edge Subscription..." Browse to the location of the new .xml file and click next.
5.	Run Synchronization Now from the Hub Transport server you can run the edge synchronization by typing "start-edgesynchronization" from the Exchange Management Shell. If it fails you can run "test-edgesynchronization" to see reasons of failure.