Exchange 2010 EMC errors out after demoting domain controller

We demoted one of our domain controllers and the Exchange 2010 EMC started erroring out on start up because it couldn't find the domain controller. We tried setting it to another DC but it wouldn't allow it since it couldn't call up the domain list from the now decommissioned DC. We ended up deleting the configuration file for EMC which allowed it to rediscover the active domain controllers. The configuration file, along with other MMC configuration files, can be found in C:\Users\<username>\AppData\Roamin\Microsoft\MMC.