Exchange Server 2013 Transport Services Won't Start After Service Pack 1 Upgrade
Exchange Server 2013 Transport services not starting after the upgrade to Service Pack 1 due to issue impacting third party transport agents.
March 5, 2014
Exchange Server 2013 Transport services not starting after the upgrade to Service Pack 1 due to issue impacting third party transport agents.
After an upgrade to Exchange Server 2013 Service Pack 1 you may discover that external email flow has stopped working.