The Contoso case study specifies the following planned change:
Add an additional email address alias for the users in Group4.
Group4 is a Microsoft 365 group containing User1 and User2. Both users have Microsoft Exchange mailboxes.
Option C is correct because the Exchange Online PowerShell Set-Mailbox cmdlet supports modifying mailbox properties, including additional SMTP email addresses.
Administrators can use the -EmailAddresses parameter with the @{Add=...} syntax to add a secondary email address without removing existing addresses or modifying the primary SMTP address.
For example:
Set-Mailbox -Identity " user1@contoso.com " `
-EmailAddresses @{Add= " user1.alias@contoso.com " }
The same operation can be performed for the other Group4 members.
Option A is incorrect because Set-MailUser manages mail-enabled users who have external mailboxes, rather than Exchange Online user mailboxes.
Option B is incorrect because Update-MgUser manages Microsoft Entra user properties and is not the appropriate cmdlet for modifying Exchange Online mailbox proxy addresses.
Option D is incorrect because Set-ADUser manages on-premises Active Directory user objects. Contoso ' s users are cloud-only, and their Exchange Online mailboxes are managed in Microsoft 365.
Therefore, Set-Mailbox is the appropriate cmdlet for implementing the planned change.
Microsoft References:
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