Network technologies by Kaiming Liao: Exchange: mail-enabled user and mail-enabled contact

An mail-enabled user attributes:

an exchange alias
an external e-mail address,
but does not have a mailbox in Exchange organization.
can log on to Active Directory and access the resources

An mail-enabled contact attributes:

an exchange alias
an external email address
no mailbox in Exchange organization
cannot log on to Active Directory

Mail-enabled Contact: Gordan Grey

Mail--enabled User: Kevin Smith

Both the mail-enabled contact and mail-enabled user share the similar E-Mail Address attribute. They have the internal email address (@itsme.com, which is my domain suffix) and an primary External email address, even though they can have many mail addresses.

Usually, mail-enabled user and contact are used for the convenience of sending email to external users from within your Exchange Organization. Your exchange organization cannot receive email for them.

By combining the mailbox and mail-enabled contact, your exchange organization can accept email and deliver it to offsite address.

[PS] E:\>New-MailContact -Name "Rommey Mitt" -ExternalEmailAddress "Rommey.Mitt@gmail.com" -Alias rMitt

[PS] E:\>New-Mailbox -Name "John McCain" -Alias JMcCain -FirstName John -LastName McCain -SamAccountName jMcCain -UserPrincipalName "John.McCain@itsme.com" -database "kmlserver\First Storage Group\Mailbox database"

Open Active Directory Users and Computers utility and locate the "John McCain" and Disable the user account;

Open Exchange Management Console and modify the John McCain mailbox's property;