Only administrators see this value in Exchange or Active Directory management tools. Specifies the name of the object in Active Directory. The display name value doesn't need to be unique, but having multiple mailboxes with the same display name would be confusing. In the Exchange Management Shell, if you don't specify a value for the display name, the value of the Name property is used. In the EAC, the display name is populated by the values that you enter for the first name, middle initial, and last name, but you can specify a custom value. Spaces and other text characters are allowed. Identifies the mailbox in the EAC, and in address lists in Outlook and Outlook on the web (formerly known as Outlook Web App).
Although these characters are allowed, they might cause problems later. Note: Don't use apostrophes (') or quotation marks (") in the alias. If you don't specify an alias value, the username part of the account name (user principal name) is used. The alias value is used to generate the primary email address ( ). For example, periods are allowed, but each period must be surrounded by other valid characters (for example, pilar.pinilla). Valid characters are letters, numbers and ASCII text characters that are allowed in email addresses. The Exchange alias (also known as the mail nickname) for the mailbox. The following table describes some of the important properties for user mailboxes. You can create user mailboxes in Exchange Server by using the Exchange admin center (EAC) or the Exchange Management Shell. This is known as mailbox-enabling an existing user. Or, you can create a new mailbox for an existing Active Directory account that doesn't have an associated mailbox. When you create a new user mailbox in Exchange, you also create the corresponding Active Directory user at the same time. Each user mailbox has an associated Active Directory account that gives the person access to the mailbox to send and receive email messages, and create meetings and appointments. User mailboxes are Exchange mailboxes that are associated with people, typically one mailbox per person.