MC1309743 - Viva Engage: Email updates for frontline users without an active Exchange mailbox

Updated August 26, 2026: We have updated the content timeline. Thank you for your patience. 

Introduction

Viva Engage will stop sending email notifications to frontline users (F1 and F3 licenses) who do not have an active Exchange mailbox.a valid mailbox or routable email destination. Previously, email notifications could still be sent to users without provisioned mailboxes,attempted for these users, resulting in repeated delivery retries, increased load on email systems, andand, in some casescases, delays to the delivery of important business communications.

This change reduces unnecessary email traffic, improves delivery efficiency, and helps ensure business-criticalimportant communications are delivered reliably and on time.

Users with supported mailbox configurations, including cloud mailboxes, on-premises mailboxes, shared mailboxes, and other routable email destinations, will continue to receive Viva Engage email notifications as expected.

Notifications delivered through supported channels such as Microsoft Teams remain unaffected.

When this will happen:

General Availability (Worldwide): Rollout begins mid-JuneSeptember 2026 (previously end of August) and is expected to complete by early Augustend of October 2026 (previously end of September).

How this affects your organization:

Who is affected:

• Frontline users assigned F1 and F3 licenses without an active Exchange OnlineUsers who do not have a valid mailbox or routable email destination.
• Microsoft 365 admins managing Viva Engage users and Exchange licensingmailbox configurations.

What will happen:

• Viva Engage will no longer attempt to send email notifications to users without active Exchange mailboxes.who do not have a valid mailbox or routable email destination.
• Users with valid Exchangecloud, on-premises, shared, or other supported mailbox licensesconfigurations will continue to receive email notifications as usual.expected.
• This change does not affect the existing email notification experience for users with a valid mailbox or routable email destination.
• Notifications delivered viathrough Microsoft Teams or other supported channels are not impactedimpacted..
• The change is enabled by default and applies automatically.
• Organizations may see:
  • Reduced load on email systems and gateways.
  • Fewer retry attempts for undeliverable messages.
  • Improved email delivery reliability for critical emails.efficiency and reliability.

What you can do to prepare:

• No action is required.
• Review your Exchange Online licensing configuration to identify users without mailbox access.
• Evaluate your notification strategy (e.g., Teams vs. Email) for frontline workers.
• Inform helpdesk and user support teams of the expected behavior change.
• Update internal documentation if email notifications are referenced for frontline users.

Compliance considerations:

• Alters how existing customer data is processed: Email notifications to users without mailboxes are no longer attempted, reducing unnecessary processing of undeliverable messages.
• No other compliance impacts identified.