Error code is 1603 when installing Exchange 2013 CU2
Error:Unable to remove product with code 4934d1ea-be46-48b1-8847-f1af20e892c1. Fatal error during installation. Error code is 1603.
Last error reported by the MSI package is 'Unable to install because a previous Interim Update for Exchange Server 2013 Cumulative Update 1 has been installed.
Please use Add/Remove Programs to uninstall the Interim Update before running this setup again.'.
1.) Uninstall the KB2874216
2.) Start MSExchange services.Set to the services to Automatic/maual and start the services