Hi All, I have Single Exchange Server for multiple child domains AD. My Exchange server is sitting on the forest root domain. We had recently migrated from old exchange server to a new one using move mailbox option. We have moved all the roles & referrals to the new exchange server and finally after testing it for a couple of days formatted the old server. My old exchange server was domain controller as well. Which was clean removed from AD. Now it's been 1 month that my old exchange server has been formatted. Now when ever I open Exchange System Manager I started getting the following error:- The RPC Server is unavailable Facility: Win32 ID no: c00706ba Exchange System Manager I've tried KB article 271328. But no result. Any ideas? Regards, Rajnish Malik