Registry Access Problems

If you encounter an error message that indicates Microsoft Exchange Server cannot access the registry, an incorrect value probably has been detected in this single instance and the registry could not be updated.

To resolve this problem, delete the instance and then add it back. Deleting the instance removes the old instance and enables you to start over.

Note   If you are concerned that you might be deleting a critical element from your program, call Microsoft Technical Support before making any changes.

However, sometimes deleting an instance that has a corrupt registry entry might not be successful. You can follow up by performing the following steps.

1. Stop the external instance from the Control Panel\Services dialog box.
2. Remove the instance name from the following registry value:

   CurrentControlSet\NT External\Linkage\Export" MULTI_SZ

3. Delete the following instance key from the registry:

   CurrentControlSet\<Instance Name>

This removes the external instance completely.