As revealed in the article,
"The IIS SMTP Virtual Server Component that is mentioned in this article is part of IIS 6.0, the support for which has ended with the support of Windows Server 2003. To relay emails to Office 365, use one of the supported versions of Exchange Server."
So in no case you should install and use that "IIS SMTP Virtual Server Component" at this moment. You have to uninstall it and use Exchange Server instead.