Exchange servers from Microsoft are mail transport servers for managing and storing e-mails as well as appointments and contacts.
Exchange Server is a groupware software for workgroups and multiple users. Exchange servers are equipped with various security features and prevent the threat of poisoned mailboxes, the Poison Mailboxes. If such a mailbox is detected, Exchange Server blocks access for users and other processes. They operate in a client- server architecture, requiring client software to be read on the email clients, i.e. user devices. Exchange servers use Microsoft Outlook.