Microsoft 365 Administrator Expert MS-102 Practice Question
Contoso has acquired a subsidiary that uses an external email system. You receive a spreadsheet listing 600 subsidiary email addresses. Internal users must be able to select these addresses from the global address list in Outlook, but the subsidiary users must not receive Microsoft 365 licenses or be able to sign in to Contoso's tenant. You will perform the task in the Microsoft 365 admin center only. Which action should you take to meet the requirements with the least administrative effort?
Invite each subsidiary user as a guest account in Microsoft Entra ID and then unhide the guest accounts in the address list.
Use the Add multiple contacts (CSV) option in the Contacts section of the Microsoft 365 admin center to import the 600 addresses as mail contacts.
Create an email-enabled distribution group that contains the 600 external SMTP addresses.
Create 600 resource mailboxes and set forwarding on each mailbox to the corresponding external address.
Importing the spreadsheet as mail contacts by using the Add multiple contacts (CSV) feature creates contact objects that are visible in the global address list, consume no licenses, and cannot authenticate in the tenant. Guest accounts can sign in and are hidden from Exchange address lists by default, so you would have to unhide each one. A distribution group would appear as a single address-book entry rather than individual recipients. Resource mailboxes are intended for rooms or equipment and do not automatically forward mail to external addresses.
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Microsoft 365 Administrator Expert MS-102
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