If you have any temporary or contract employees in your organization, chances are they're mail-enabled users in Active Directory (AD). That means they can access your organization's network, but they don't have a mailbox associated with their AD account. Mailbox-enabled users, on the other hand, have their own Exchange mailbox associated with their AD account. These users can log on to your network, be added to groups, and access important resources. Mailbox-enabled users are also part of the Global Address List (GAL).
Concerned about corporate data access? Use ManageEngine Exchange Reporter Plus to ensure that only your full-time employees are mailbox-enabled users.
You can obtain reports on and audit Exchange Online using Exchange Reporter Plus.
Use the Exchange Reporter Plus' Mailbox Enabled Users report to find all AD users who are mailbox-enabled users in your Exchange databases. View comprehensive information about your Exchange database, including the name of the last user who logged on and the time at which a user last logged on. You can also see information about every mailbox-enabled user, including their:
Discover details about all mailbox-enabled users—up to the last logon date, time, and user—with Exchange Reporter Plus. This solution also allows you to check on mailbox sizes, inactive mailboxes, mailbox permissions, and much more.
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A user with a mail-enabled user account has an Active Directory account, but does not have an Exchange mailbox. These users are listed in the GAL, and they can receive mail to an external email address even if they don't have a mailbox. But they cannot send or store email messages. For example, this type of user account can be used while creating for an on-site contract employee in your organization. It allows them to receive mails sent to them and to access the organization's network.
Mail-enabled users are employees who can access your network, but don't have any Exchange mailbox associated with them. These are usually your temporary employees. It is important to track them because you need to know how long they need to have access to your organization's network and resources.
You can use PowerShell to view the list of all the mail-enabled users in your organization. Follow these steps to see the list.