Windows only takes the wire protocol from DCE, and added a few things here and there. It's used extensively in Windows, e.g. the DNS MMC snapin. For NT Domains

Windows only takes the wire protocol from DCE, and added a few things here and there. It's used extensively in Windows, e.g. the DNS MMC snapin. For NT Domains it was THE protocol, until Microsoft moved to AD with more standards-based protocols, but even AD still heavily relies on RPC, i.e. for replication. The annoying thing about MSRPC is that it uses a portmapper process, like sun rpc for NFS3, so it's a pain to use with firewalls, as ports are randomly assigned. But it's widely simpler than a DCE environment, it's been made to fit internet protocols.