During an upgrade of Exchange Server 2013 to a new cumulative update some customers may experience an issue where setup fails, leaving the server in a non-operational state.
Paul is a Microsoft Exchange Server MVP and publisher of Exchange Server Pro. He also holds several Microsoft certifications including for Exchange Server 2007, 2010 and 2013. Find Paul on Twitter, LinkedIn, Facebook, or Google+. Paul is also available for consulting/support engagements.