It is not just a successor to the Entourage 2008.Exchange server is generally connected in order to change the settings of Entourage to Outlook 2011. The Outlook 2011 is made by Microsoft with an intention for the Outlook to work on the Mac easily. Here, in this article, we will discuss the causes for Outlook cannot connect to the Exchange Server Error Code 18597 and the. In most of the cases, the Outlook users face the problem while connecting to Exchange Server. The MS Outlook 2011 for Mac uses Exchange Web services and it does not connect to MS Exchange in a way which allows the user to work in the non-cached environment. Plus, it is also known as the upgraded version of the Entourage 2008 which came before the MS Outlook 2011. It was specifically designed for the emailing purpose. For Mac operating system the new version of MS Outlook was launched as MS Outlook 2011 for Mac.