Microsoft has withdrawn an Exchange Server 2013 security update that it issued earlier this week. Microsoft cited installation issues and inadequate testing for the patch. The bug doesn’t affect Exchange 2007 or Exchange 2010 because they have a different architecture. In July, Microsoft recalled four bad patches, including three that were part of the “Patch Tuesday” release cycle. The company also withdrew a patch last December, when it also recalled four other bad patches that were released in July. Expert: “I don’t see this as indicative of a larger quality control problem at Microsoft””]
Source: https://www.csoonline.com/article/2133850/microsoft-yanks-troublesome-exchange-security-patch.html