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Enable-MailUser

Use the Enable-MailUser cmdlet to mail-enable existing users that aren't already mail-enabled. Exchange PowerShell reference

From the Exchange PowerShell reference 12 parameters Its page in the reference

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Parameters

12 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the user that you want to mail-enable.
-ExternalEmailAddressThe ExternalEmailAddress parameter specifies an email address outside the organization.
-AliasThe Alias parameter specifies the Exchange alias (also known as the mail nickname) for the recipient.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DisplayNameThe DisplayName parameter specifies the display name of the mail user.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-MacAttachmentFormatThe MacAttachmentFormat parameter specifies the Apple Macintosh operating system attachment format to use for messages sent to the mail contact or mail user.
-MessageBodyFormatThe MessageBodyFormat parameter specifies the message body format for messages sent to the mail contact or mail user.
-MessageFormatThe MessageFormat parameter specifies the message format for messages sent to the mail contact or mail user.
-PrimarySmtpAddressThe PrimarySmtpAddress parameter specifies the primary return email address that's used for the recipient.
-UsePreferMessageFormatThe UsePreferMessageFormat specifies whether the message format settings configured for the mail user or mail contact override the global settings configured for the remote domain or configured by th…
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.