Shared Inbox in Outlook: Setup & Management

Creating a Shared Mailbox (Admin)

1. Sign in to the Microsoft 365 Admin Center (admin.microsoft.com).
2. Navigate to Teams & groups → Shared mailboxes.
3. Click Add a shared mailbox.
4. Enter a name (e.g., "Support") and email address (e.g., support@yourcompany.com).
5. Click Save changes.
6. Under the new mailbox, click Members → Edit.
7. Add team members who need access.
8. Click Save.

Accessing the Shared Mailbox in Outlook

Outlook Desktop

The shared mailbox usually appears automatically in the left panel after being added by an admin. If it does not:

1. Right-click your email address in the folder pane.
2. Select Add shared folder.
3. Type the shared mailbox email address.
4. Click Add.

Outlook on the Web

1. Click your profile icon → Open another mailbox.
2. Type the shared mailbox email address.
3. Click Open. It opens in a new browser tab.

Sending Emails from the Shared Mailbox

1. Open a new email.
2. Click From in the message header.
3. Select the shared mailbox address.
4. Compose and send. The email will appear to come from the shared address, not your personal email.

Permissions and Settings

• Full Access: Members can read, reply, and manage emails in the shared mailbox.
• Send As: Members can send emails that appear to come from the shared address.
• Send on Behalf: Emails show "[Name] on behalf of [shared mailbox]."
• Auto-mapping: Enabled by default. The shared mailbox automatically appears in Outlook. Disable via PowerShell if needed.

Limitations of Outlook Shared Mailboxes

• No assignment: You cannot assign specific emails to team members within Outlook.
• No collision detection: Two people can reply to the same email simultaneously.
• No internal notes: No way to add private team comments on emails.
• No automation: No auto-routing, auto-tagging, or rule-based assignment.
• 50 GB limit: Shared mailboxes are limited to 50 GB without a license.
• No mobile app: Shared mailboxes are not natively supported in Outlook mobile. Workarounds exist but are limited.
• No analytics: No built-in reporting on response times or team performance.

When to Upgrade from Outlook

Outlook shared mailboxes work for basic use cases. Consider dedicated shared inbox software when you need assignment, automation, analytics, or AI features.

For Gmail setup, see Gmail shared inbox. For comparisons, check collaborative inbox vs shared mailbox, best tools, and shared inbox vs distribution list.

Also explore shared inbox guide, best practices, and AI email tools.

Explore all guides in this series: shared inbox guide, shared inbox software, best shared inbox, Gmail shared inbox, inbox management, best practices, for teams, Google Workspace, customer support, solutions, vs distribution list, CRM shared inbox, free shared inbox, collaborative vs shared mailbox.