MC1519843 - New Outlook for Windows: All Accounts view brings email into a single inbox view

Microsoft 365 Message Center announcement MC1519843.

MS Message Center's Summary

The new Outlook for Windows is introducing an All Accounts view, providing users with a unified inbox that displays messages from multiple connected accounts in one place without merging mailboxes. Global rollout is underway and expected to finish by late October 2026. Administrators should review internal communication policies and prepare for upcoming administrative controls that will manage default settings for this feature.

Administrator impact
No direct administrator action is required.
End user impact
Users with multiple connected accounts can triage messages from all accounts within a single unified view.
Importance
3/10: This is a feature rollout with minor user workflow changes and no immediate administrative tasks.

Microsoft Summary

The new Outlook for Windows introduces an All Accounts view, a unified inbox showing emails from multiple accounts separately without merging. It supports AI-assisted workflows and search, rolling out globally by late October 2026. No admin action is needed now; controls will be available later.

Message Center ID
MC1519843
Category
stay Informed
Severity
normal
Services
Exchange Online, Microsoft Copilot (Microsoft 365)
Tags
New feature, User impact
Roadmap ID
564609
Platforms
Web
Published
2026-10-21
Last updated
2026-10-21
Expires
2026-12-31

[What and Why:] The All Accounts view, also known as Unified Inbox, lets users see email from multiple connected accounts in a single inbox view in the new Outlook for Windows without merging their mailboxes. Each account's inbox stays separate, and All Accounts view brings messages together so users can triage mail from one place. Users can read, delete, search, move, archive, and mark messages across accounts without switching between mailboxes. The experience integrates with Copilot for AI-assisted email workflows and supports Search with Copilot for finding messages across the user's primary account. [Rollout Schedule:] General Availability (Worldwide): We began rolling out in late September 2026 and expect to complete by late October 2026. [Impact on Your Organization:] Users with more than one connected account in the new Outlook for Windows will be able to triage email across accounts from a single All Accounts view. This does not merge mailboxes or move messages between accounts. Each account remains separate, and All Accounts view provides a unified view only. [Action Required/Recommendations:] No admin action is required at this time. New admin controls for Unified Inbox are planned for release later in October 2026. Once available, admins will be able to manage whether Unified Inbox is enabled or disabled by default and whether users can change that setting. We will provide updated documentation and rollout guidance when the admin controls become available. [Compliance considerations:] This feature provides a unified view across connected accounts in the new Outlook for Windows but does not merge mailboxes or move messages between accounts. Review your organization's Outlook account and automated-assistance policies as appropriate.