I have 2 DC's on my Windows 2008 domain. If in power down one of the domain controllers I lose connectivity to some of my netwrok resources. Some, but not all, users will lose access to their Exchange mailbox. Accessing shares takes a very long time. I checked both domain controllers and they are both global catalog servers. One DC has all of the FSMO roles. What is it about the dc's that could be causing thsi issue? I thought that you should be able to run the network if one of the dc's goes down without issue. One thing that changed was the dc's were both physical servers but have been conerted to vm's. Could that have anything to do with this issue?