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Microsoft Purview | Data lifecycle management – Auto archive for Exchange Online

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
Microsoft Purview
Microsoft 365 admin center

Rollout

Roadmap
515172

Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".

What the notice says

Microsoft’s text, safely structured

Introduction

We’re introducing Auto Archiving for Exchange Online to help prevent mail flow disruptions caused by mailboxes reaching their storage quota. This update ensures real-time mailbox health monitoring by automatically moving the oldest items to the archive when mailbox usage exceeds 96% of its quota. This feature addresses customer feedback for proactive mailbox space management and helps maintain business continuity.

When this will happen

  • Public Preview: Rollout began in mid-November 2025 and is expected to complete early December 2025
  • Worldwide rollout: Rollout begins in early January 2026 and is expected to complete late January 2026

How this affects your organization

Who is affected: Admins managing Exchange Online mailboxes with provisioned archive mailboxes.

What will happen

  • When a primary mailbox exceeds 96% of its quota, Managed Folder Assistant will automatically archive the oldest items until usage drops below the threshold.
  • Applies to both IPM folders and Recoverable Items folders.
  • Honors Never Move to Archive tags.
  • Enabled by default for all tenants.
  • Archive mailbox must be provisioned and have available space for auto-archiving to occur.

What you can do to prepare

  • No immediate action is required unless you want to adjust or disable this feature.
  • To disable auto-archiving for a mailbox: Set-Mailbox <user-smtp-address> -AutoArchivingEnabled $false
  • To adjust the organization-level threshold (default = 96%, valid range = 80–100): Set-OrganizationConfig –AutoArchivingThresholdPercentage <value>
  • If set to 100, auto-archiving will not occur for the tenant.
  • Review internal documentation and communicate this change to helpdesk staff.

Learn more:

Compliance considerations

No compliance considerations identified, review as appropriate for your organization.

What changed

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The archive supplies one version of this notice.

Learn more

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What this page cannot tell you
  • Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.
  • 1 linked page has not been read yet.
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