You have Microsoft 365 E5 subscription that contains the identities shown in the following table. You create a shared mailbox named Shared1. Which identities can you add to Shared1 as a member?

The correct answer is D. User1 and Group3 only. Shared mailboxes in Exchange Online support individual user accounts and mail-enabled security groups as members. In this scenario, User1 is a standard user account and Group3 is implied to be a mail-enabled security group - both are valid member types. Why the others are…

Submitted by diego_uy· Apr 18, 2026Implement and manage identity and access

Question

Exhibit

Options

AUser1 only
BUser1 and Group1 only
CUser1 and Group2 only
DUser1 and Group3 only
EUser1, Group2, and Group3 only

How the community answered

(41 responses)

A
2% (1)
B
2% (1)
C
15% (6)
D
73% (30)
E
7% (3)

Explanation

Shared mailboxes in Exchange Online support individual user accounts and mail-enabled security groups as members. In this scenario, User1 is a standard user account and Group3 is implied to be a mail-enabled security group - both are valid member types. Why the others are wrong: Group1 (a distribution group) cannot be granted mailbox permissions directly; distribution groups are for email routing only, not for assigning mailbox access. Group2 (a Microsoft 365 Group) has its own mailbox and cannot be added as a member to a separate shared mailbox. Shared mailbox membership (which controls 'Full Access' permissions) requires individual users or mail-enabled security groups, making option D (User1 and Group3) the only valid combination.

Topics

#Shared mailbox#Exchange Online#Member management#Identity constraints

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