Will explore about why Microsoft Exchange Server is calendaring software, a mail server and contact manager developed by Microsoft. It is a server program that runs on Windows Server and is part of the Microsoft Servers line of products. Windows Messaging, initially also called Microsoft Exchange, is an e-mail client that was included with Windows 95 (beginning with OSR2), 98 and Windows NT 4.0.Introduced the new Exchange Administrator console, as well as opening up “integrated” access to SMTP-based networks for the first time. Unlike Microsoft Mail (which required a standalone SMTP relay), Exchange Server 5.0 could, with the help of an add-in called the Internet Mail Connector, communicate directly with servers using SMTP. Version 5.0 also introduced a new Web-based e-mail interface called Exchange Web Access, which was rebranded as Outlook Web Access in a later Service pack. Along with Exchange Server version 5.0, Microsoft released version 8.01 of Microsoft Outlook, version 5.0 of the Microsoft Exchange Client and version 7.5 of Microsoft Schedule+ to support the new features in the new version of Exchange Server. Exchange Server 5.0 introduced a number of other new features including a new version of Outlook Web Access with Calendar support, support for IMAP4 and LDAP v3 clients and the Deleted Item Recovery feature.