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A blank Microsoft Purview retention-policy list does not prove that Exchange Online has no retention behavior. Exchange uses a separate legacy system—Messaging Records Management (MRM)—with a Default MRM Policy that is normally applied to new users. It can move older mail to an archive even when no modern Purview retention policy is listed. To find out what applies to a mailbox, check its assigned MRM policy and that policy’s linked tags in Exchange Online PowerShell.
Two systems, both called retention
Exchange Online administrators can encounter “retention” in two different systems. Their settings are not interchangeable, and an empty view in one does not settle what the other is doing.
| Exchange MRM | Microsoft Purview retention |
|---|---|
| Uses retention tags grouped into an MRM retention policy assigned to a mailbox. | Uses retention policies and retention labels, with policies scoped to locations such as Exchange, SharePoint, OneDrive, and Teams. |
| Handles mailbox lifecycle actions such as moving older mail to an Exchange archive mailbox, or deleting content under applicable tags. | Supports broader information-governance requirements, including retaining content, deleting it, or retaining it before deletion. |
| Processed in Exchange by the Managed Folder Assistant. | Processed asynchronously by Microsoft 365 retention services. |
| Best fit when the requirement is automatic movement of mail to an Exchange archive. | Best fit for organization-wide or cross-workload retention and deletion requirements. |
Microsoft recommends Purview for broader retention and deletion governance, while continuing to use MRM when the goal is to move messages to archive mailboxes. See Microsoft’s explanation of the Default MRM Policy and Purview retention policies.
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Exchange Online normally applies the Default MRM Policy to new users. Administrators can assign a different MRM policy to a mailbox, but cannot designate a different policy as the automatic default for future users. The documented default policy normally contains the following tags; administrators may have changed the tenant’s configuration.
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| Tag | Tag type | Age | Action |
|---|---|---|---|
| Default 2 years move to archive | Default policy tag (DPT) | 730 days | Move to Archive |
| Recoverable Items 14 days move to archive | Recoverable Items folder tag | 14 days | Move to Archive |
| Personal 1 year move to archive | Personal | 365 days | Move to Archive |
| Personal 5 year move to archive | Personal | 1,825 days | Move to Archive |
| Personal never move to archive | Personal | No age limit | Move to Archive |
| 1 Week Delete | Personal | 7 days | Delete and Allow Recovery |
| 1 Month Delete | Personal | 30 days | Delete and Allow Recovery |
| 6 Months Delete | Personal | 180 days | Delete and Allow Recovery |
| 1 Year Delete | Personal | 365 days | Delete and Allow Recovery |
| 5 Years Delete | Personal | 1,825 days | Delete and Allow Recovery |
| Never Delete | Personal | No age limit | Delete and Allow Recovery |
| Junk Email | Retention policy tag (RPT) | 30 days | Delete and Allow Recovery |
The key distinction is between a default policy tag and a personal tag. The two-year archive DPT applies to untagged items across the mailbox. Personal tags are choices that can be applied to particular folders or items; their presence in the policy does not mean that every message gets that tag.
The standard policy does not include a mailbox-wide default policy tag that deletes ordinary mail after a set period. Its personal deletion tags are not automatic actions for all messages. The Junk Email folder has its own 30-day tag. “Move to Archive,” “Delete and Allow Recovery,” and permanent deletion are different outcomes. For the current documented list, see Microsoft’s Default MRM Policy reference.
Why an admin page can look blank
Start by identifying which page is empty. A Purview retention-policy page with no entries means no modern policy is visible there; it does not mean the mailbox lacks an MRM policy. Conversely, seeing a policy object called Default MRM Policy in an Exchange view does not prove it has tags linked to it or is assigned to the mailbox you are investigating.
- Purview’s retention-policy list is empty: Check the mailbox’s Exchange MRM assignment separately.
- An Exchange policy appears to have no tags: Verify its
RetentionPolicyTagLinksin PowerShell; do not rely on an incomplete-looking UI. - The mailbox has no
RetentionPolicyvalue: It may have no MRM policy assigned, even if an archive mailbox exists. - A populated policy appears to do nothing: Check the applicable tag, archive status, holds, processing controls, and elapsed time.
An MRM policy can exist with no linked tags, but Microsoft does not recommend that configuration because items may never expire under MRM. It is a configuration state to investigate, not proof of corruption. See Microsoft’s guidance on retention tags and policies.
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Verify the mailbox and policy with PowerShell
Connect to Exchange Online, then inspect the affected mailbox. Replace the example address with the mailbox you are troubleshooting.
Connect-ExchangeOnline
Get-Mailbox [email protected] |
Format-List DisplayName,
RetentionPolicy,
RetentionHoldEnabled,
ElcProcessingDisabled,
ArchiveStatus,
ArchiveName,
InPlaceHoldsRetentionPolicy is the mailbox’s assigned MRM policy. The remaining properties help explain why expected actions may not occur:
RetentionHoldEnabled: a retention hold can suspend normal expiry behavior.ElcProcessingDisabled: ifTrue, MRM processing is disabled for the mailbox.ArchiveStatusandArchiveName: indicate whether an archive mailbox is provisioned. An archive action needs a usable archive destination.InPlaceHolds: can reveal hold-related behavior that affects deletion.
Next, inspect the policy’s linked tags. Substitute the policy name reported for the mailbox if it is not the default.
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Get-RetentionPolicy -Identity "Default MRM Policy" |
Format-List Name,RetentionPolicyTagLinks
$tags = (Get-RetentionPolicy -Identity "Default MRM Policy").RetentionPolicyTagLinks
$tags | ForEach-Object {
Get-RetentionPolicyTag -Identity $_
} | Format-Table Name,
Type,
AgeLimitForRetention,
RetentionAction,
RetentionEnabledIf RetentionPolicyTagLinks is empty, the policy has no linked tags. If the links are populated, inspect whether those tags are enabled and whether their age and action match the intended design. A tag does not affect a mailbox merely because it exists: it must be linked to a policy assigned to the mailbox, and the Managed Folder Assistant must process it. See Microsoft’s tag-management guidance.
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Interpret the results before making changes
| Finding | Likely meaning | Next step |
|---|---|---|
RetentionPolicy is Default MRM Policy and its tags are populated |
Legacy MRM is assigned; Purview may still have no policies. | Check the relevant tag, archive provisioning, holds, and processing. |
RetentionPolicy is empty |
No MRM policy is assigned to this mailbox. | Compare it with a known-good mailbox of the same type before assigning anything. |
| The policy exists but tag links are empty | The policy has no linked MRM actions. | Validate the approved retention and archive design before restoring tags. |
ElcProcessingDisabled is True |
MRM processing is disabled. | Find out why before changing the setting. |
RetentionHoldEnabled is True |
Expiry behavior may be suspended. | Review the mailbox’s lifecycle and the reason for the hold. |
| Archive status shows no usable archive | Move-to-archive actions lack a destination. | Check archive provisioning and the mailbox’s licensing entitlement. |
InPlaceHolds contains entries |
Permanent deletion may be blocked or affected by a hold. | Review the legal and compliance requirements with the responsible team. |
Troubleshoot by symptom
Purview has no retention policies
Record that no modern Purview policy is visible, then check Exchange MRM rather than treating the Purview page as authoritative for mailbox archiving:
Get-Mailbox [email protected] | Format-List RetentionPolicy
Get-RetentionPolicy -Identity "Default MRM Policy" |
Format-List Name,RetentionPolicyTagLinksIf the mailbox is assigned the default policy and its tags are populated, MRM behavior can still apply. If your requirement is organization-wide retention across workloads, separately determine whether a Purview policy or label is needed.
The mailbox has no MRM policy
Do not assign a policy blindly in production. First compare the affected mailbox with a known-good mailbox of the same type, including archive status and policy assignment:
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Get-Mailbox [email protected] |
Format-List RetentionPolicy,ArchiveStatus,ArchiveName
Get-Mailbox [email protected] |
Format-List RetentionPolicy,ArchiveStatus,ArchiveNameIf your approved design calls for a custom MRM policy, assign only a confirmed policy name, preferably after piloting the change:
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Set-Mailbox [email protected] -RetentionPolicy "Policy Name"Microsoft’s mailbox policy procedure also recommends inspecting a policy and its tags before applying it.
The policy exists but is empty
Confirm the empty link list with PowerShell. Then compare the policy with the organization’s approved design. Restoring Microsoft’s documented defaults may be inappropriate where legal, regulatory, contractual, or internal requirements specify different treatment. Test changes on a pilot mailbox, document the previous state, and have the appropriate records-management or compliance authority approve destructive deletion behavior.
Be cautious when removing tags, too: removing a tag from a policy does not necessarily stop behavior on items already stamped with that tag. Deleting a tag itself can have broader effects, including mailbox restamping. Read Microsoft’s notes on tag changes before altering production configuration.
The policy is populated but mail does not move or expire
Check that the message has reached the age specified by its applicable tag, and that an explicit personal tag or folder tag has not changed the result. Confirm that an archive mailbox exists for archive actions, processing is enabled, and the item type is supported. Then review holds and allow for asynchronous processing.
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You can request MRM processing for one mailbox with:
Start-ManagedFolderAssistant -Identity [email protected]This requests processing; it is not a promise of an immediate visible change. The Managed Folder Assistant is throttled and runs as an Exchange service. The command does not override holds, disabled processing, archive-provisioning issues, licensing requirements, or unsupported item types. Purview Exchange retention processing can take up to seven days, and Microsoft says the Exchange location must contain at least 10 MB before retention settings apply. See Microsoft’s Exchange retention guidance.
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Exchange retention settings may display a policy name and calculated expiry date on a message in Outlook. That display is not a complete inventory of all retention controls: retain-only policies may not show a name or expiry date, a retention label can take precedence in the display, and the shortest applicable expiry date may be shown. An absent date or label in Outlook does not establish that no policy exists. See Microsoft’s Outlook instructions.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteNor is an expiry date necessarily the date content is permanently erased. Deleting a message normally moves it to Deleted Items; Shift+Delete bypasses that folder and moves it to Recoverable Items. Retention and holds can preserve content in Recoverable Items, and an expiry action is not necessarily a hard delete at that instant. For retain-and-delete scenarios, Microsoft says permanent deletion can occur within 14 days after expiry by default, with the period configurable up to 30 days. Another retention policy, label, or eDiscovery hold can prevent permanent deletion when it requires the content to be retained.
Scope and exceptions to check
Exchange retention policies and labels support common content such as mail and attachments, drafts, sent messages, notes, tasks with an end date, and—under retention policies—calendar items with an end date. Contacts, tasks without end dates, and calendar items without end dates are not supported in the same way. Public folders are supported for retention policies. Teams or Skype content may be stored or represented elsewhere and has separate retention behavior; do not assume an Exchange mailbox policy covers it. Consult Microsoft’s supported-content details for the exact workload and item type.
Which system should you use?
- Use MRM when the goal is automatic movement of older mail into an Exchange archive, users need Outlook archive-policy choices, or an existing tested mailbox design depends on MRM tags.
- Use Purview retention policies for centralized retention or deletion across Microsoft 365 workloads, with scopes and locations suited to the governance requirement.
- Use retention labels when different items need different treatment, item-level classification is important, or a records program needs a more specific disposition process.
These systems overlap but are not interchangeable. MRM is mailbox-oriented and useful for archive movement; Purview is designed for broader governance. Licensing and feature availability depend on the organization’s plan and scenario, so verify entitlements in Microsoft’s current licensing information rather than buying an add-on to troubleshoot an unknown configuration.
Before you change a production policy
- Identify whether the missing view is in Purview or Exchange MRM.
- Record the mailbox’s
RetentionPolicy, processing flags, archive status, and holds. - Inspect the assigned policy’s linked tags, enabled state, age, and action.
- Confirm the intended outcome: archive, recoverable deletion, or permanent deletion.
- Validate archive provisioning and policy scope; compare with a known-good mailbox.
- Test approved changes on a pilot mailbox and document the before-and-after configuration.
- Allow for processing time, then verify the result without assuming that a manual assistant request is immediate.
For further detail, see Microsoft’s overview of Messaging Records Management in Exchange Online and its Exchange retention troubleshooting guidance.
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