The company withdrew Critical Fix MS13-061 , which was released as part of Patch Tuesday, and is aimed at fixing Remote Code Execution vulnerabilities in Exchange Server versions 2007, 2010 and 2013. In particular, problems have arisen with installing a patch on Exchange Server 2013 systems. The Microsoft Exchange Search Host Controller service is renamed. ”.
If the patch has been installed, you should use KB 2879739 to correct the situation.