If you create a new Receive Connector on a Multi-Role box, you have the ability to choose where the connector is setup: HubTransport or FrontendTransport. If a Connector is mistakenly created in HubTransport this can cause many issues. Receive Connectors should always only be created on FrontendTransport. So please make it the default in this case...
My understanding is that the SMTP Queue viewer is only available in the Exchange toolkit on the Exchange 2013 mailbox server. Would prefer to have the Queue viewer available in the web-based EAC.
Using the support provided for DLP rules in 2013 we would like to use these same matching rules to applying a Retention and\or Archiving tag to messages based on their content.
Exchange 2007/2010 supported the Connection Filtering Agent on the Hub Transport role. This agent is not available on the Exchange 2013 CAS and Mailbox roles.
This means we can't use real-time block lists on Exchange 2013 servers. Which is a shame because RBL's have proven to be a great measurement against spam.