check before: 2026-04-15
Product:
Exchange, Microsoft 365 Apps, Outlook, Windows
Platform:
Online, Web, World tenant
Status:
Change type:
Feature update, User impact, Admin impact
Links:
Details:
Summary:
A new OWAMailboxPolicy setting, AttachmentsOfflineEnabledWin, will roll out mid-April 2026, allowing admins to control offline access to file attachments in the new Outlook for Windows. It is enabled by default and works alongside the existing OfflineEnabledWin policy without affecting its configuration.
Details:
[Introduction]
We are introducing a new OWAMailboxPolicy setting that allows administrators to control whether file attachments are available when users work offline in the new Outlook for Windows. This change adds a tenant-level configuration option for managing offline attachment access while preserving existing offline policy behavior by default.
[When this will happen:]
The new policy will rollout mid-April 2026
Change Category:
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Scope:
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Release Phase:
Created:
2026-03-24
updated:
2026-03-24
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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summary for non-techies**
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Direct effects for Operations**
Offline Access to Attachments
If the new policy is implemented without preparation, users may find themselves unable to access important file attachments while working offline, leading to potential delays in work and communication.
- roles: Exchange Online Administrators, End Users
- references: https://learn.microsoft.com/powershell/module/exchangepowershell/set-owamailboxpolicy?view=exchange-ps
User Experience Disruption
The default enabling of the new policy may disrupt user workflows if they are accustomed to accessing attachments offline, resulting in frustration and decreased productivity.
- roles: End Users, IT Support Staff
- references: https://learn.microsoft.com/powershell/module/exchangepowershell/set-owamailboxpolicy?view=exchange-ps
Configutation Options**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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Last updated 2 weeks ago ago
