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.
It's 2013 and we still have a reliance on the LegacyExchangeDN within the Outlook client.
Update all supported clients to only cache the SMTP address in the autocomplete/nickname cache and when stored as properties on items.