Mailbox ManagementUser Mailbox Configuration

User Mailbox Configuration

25 mins

Understanding the Concept

User mailboxes in Exchange Online store email, calendar, contacts, and tasks. Each mailbox is associated with an Azure AD user account and requires an appropriate Exchange Online license (Plan 1 or Plan 2).

Mailbox properties include storage quotas, retention policies, archive settings, and language/time zone configurations. These can be managed individually via EAC or in bulk using PowerShell.

Mailbox permissions control who can access or act on behalf of other mailboxes. The three permission types are Full Access, Send As, and Send on Behalf, each providing different levels of access.

Key Points

•Mailbox requires Azure AD user account with Exchange license

•Default mailbox size: 50GB (Plan 1) or 100GB (Plan 2)

•In-Place Archive provides unlimited archive storage (Plan 2)

•Full Access allows opening another user's mailbox

•Send As allows sending as another user (no indication)

•Send on Behalf sends with 'on behalf of' notation

Why This Matters

Mailbox management is the most common daily task for Exchange Online administrators. Understanding mailbox types, permissions, and quotas is essential for provisioning users and resolving access issues.

Common Mistakes to Avoid

✗Confusing Send As with Send on Behalf permission behavior

✗Not enabling auto-mapping when granting Full Access permissions

✗Forgetting to assign appropriate license before creating mailbox

Interview Discussion Points

💡Explain the three mailbox permission types and their differences

💡Describe how to manage mailbox quotas and archive policies

💡Discuss bulk mailbox management using PowerShell

MS-203 Exam Tips

📝Know mailbox size limits for each Exchange Online plan

📝Understand Full Access vs Send As vs Send on Behalf permissions

📝Be familiar with PowerShell cmdlets: Get-Mailbox, Set-Mailbox, Add-MailboxPermission

Quarantine Management

Resource & Shared Mailboxes