Mail Archiving Issue

Question

Mail Archiving Issue

IT HELPDESK 40

Dear Microsoft Team,

We are using Microsoft Business Outlook mail and I need your assistance regarding one issue.

Currently, my college mailbox storage is almost 80% full. I would like to move old emails to the Archive folder for the period from 01.01.2025 to 31.12.2025 (Inbox and Sent Items).

I already know the steps to manually move emails to the Archive folder. However, I need your guidance on how to correctly mention the time period in the Retention Policy settings.

For example:

Move emails older than 12 months

Similarly ,I would like to know how to configure or mention a specific date range such as 01.01.2025 to 31.12.2025.

Previously, one of my colleague’s mailboxes was configured with the policy “Move emails older than 12 months,” but it did not work properly. Therefore, this time I would like your help to correctly set the Retention Policy name Only .

Note: I would like to clarify again that I already know how to Automatically move emails to the Archive folder.

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Answer accepted by question author

Vasil Michev 127K MVP Volunteer Moderator

To clarify one point - the Archive folder is not the same thing as the Online Archive. If you move items to the former, either manually or via retention policy, this will not affect the mailbox quota in any way. Moving items to the Online archive on the other hand will free up space/reduce the used quota.

IT HELPDESK 40 Reputation points

2026-05-25T06:28:28.6733333+00:00

Dear Microsoft Team,

I need your assistance regarding an email archiving policy. I would like to automatically move emails from the period 01.01.2025 to 31.12.2025 (Inbox and Sent Items) to the Archive folder using a retention policy.

I already know the steps to move emails to the Archive folder. However, I need guidance on selecting or configuring the correct Retention Policy / Retention Tag name for this requirement.

3 additional answers

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IT HELPDESK 40 Reputation points

2026-05-25T06:28:28.6733333+00:00

Dear Microsoft Team,

I need your assistance regarding an email archiving policy. I would like to automatically move emails from the period 01.01.2025 to 31.12.2025 (Inbox and Sent Items) to the Archive folder using a retention policy.

I already know the steps to move emails to the Archive folder. However, I need guidance on selecting or configuring the correct Retention Policy / Retention Tag name for this requirement.

Answer 1

IT HELPDESK 40

Dear Microsoft Support Team,

I accept your previous response. However, I need a proper automated solution for mailbox storage management.

One of my colleague’s mailboxes has reached 80% capacity. To reduce mailbox usage, I want to create a retention/archive policy that will automatically move all emails from Inbox and Sent Items for the period from 01.01.2025 to 31.12.2025 into the Archive folder.

I do not want to move emails manually, as this issue has occurred for the third time and manual migration is becoming a time-consuming task every time. Therefore, kindly suggest the proper retention/archive policy configuration and policy name that can automatically move old emails to the Archive mailbox.

Your guidance will be very helpful for us in managing mailbox storage efficiently in the future.

Teddie-D 17,800 Reputation points Microsoft External Staff Moderator

2026-05-25T08:12:36.42+00:00
Hi IT HELPDESK

Please note that we're not Microsoft support, this is a user-to-user support forum. Moderators here don’t have backend access to Microsoft systems, so we can only provide technical guidance based on the public resources.

I understand that you’re looking for a long-term automated solution to reduce mailbox usage without needing to manually move emails each time.

For this scenario, the recommended approach is to use an Exchange Online retention tag + retention policy that automatically moves older items from the primary mailbox to the Online Archive mailbox.

1.First, confirm that the Online Archive is enabled for the mailbox.

This is important because only moving items to the Online Archive mailbox will reduce the primary mailbox quota usage.

2.Create retention tags

You can create separate tags such as:

-Inbox:

Type: Retention Policy Tag (Inbox)

Retention action: Move to Archive

Age limit: 365 days

-Sent Items:

Type: Retention Policy Tag (Sent Items)

Retention action: Move to Archive

Age limit: 365 days

3.Create retention policy

Add both retention tags to a retention policy, then assign it to the mailbox. You can refer to Apply a retention policy to mailboxes in Exchange Online | Microsoft Learn

This configuration will automatically move all emails older than 365 days to the Online Archive mailbox. However, it is important to note that retention policies cannot target a fixed date range as mentioned previously.
IT HELPDESK 40 Reputation points

2026-05-25T09:22:41.89+00:00

Dear Microsoft Support,

I need only the Retention Policy name and Retention Tag name.

Please confirm whether the following retention setting name is correct:

“Automatically move emails from 01.01.2025 to 31.12.2025.”
Teddie-D 17,800 Reputation points Microsoft External Staff Moderator

2026-05-26T00:53:36.02+00:00
Hi IT HELPDESK

Please note that we're not Microsoft support, this is a user-to-user support forum. Moderators here don’t have backend access to Microsoft systems, so we can only provide technical guidance based on the public resources.

The suggested name “Automatically move emails from 01.01.2025 to 31.12.2025” is not recommended, as it can be misleading. Retention policies in Exchange Online do not work based on fixed calendar date ranges. Instead, they operate on the age of item.

Therefore, using a date-specific name could cause confusion later. A more accurate and sustainable naming approach would be to reflect the actual behavior of the policy, such as:

Move items older than 365 days

Archive emails after 1 year

This ensures the name aligns with how retention policies truly function and avoids misinterpretation in the future.
IT HELPDESK 40 Reputation points

2026-05-26T06:18:55.93+00:00

Dear Microsoft support ,

Move Emails Older Than Last One Year

This correct policy name or wrong
Teddie-D 17,800 Reputation points Microsoft External Staff Moderator

2026-05-26T07:33:44.0333333+00:00

Hi IT HELPDESK
“Move Emails Older Than Last One Year” is a valid name. Retention policy and retention tag names are just labels and do not affect how the policy is configured or applied, so you can name it clearly to make it easier to understand and avoid any misunderstanding.
Teddie-D 17,800 Reputation points Microsoft External Staff Moderator

2026-05-27T07:33:59.9966667+00:00

Hi IT HELPDESK
Just checking in to see if you need any further assistance with this thread.

Answer 2

Hi IT HELPDESK

Please note that in Microsoft 365 / Outlook retention policies, it is not possible to define a fixed date range such as 01.01.2025–31.12.2025 directly in the retention settings. Retention tags are based on the age of items, not specific calendar dates. Instead, retention is configured as a time-based duration, for example:

365 days = 12 months
730 days = 24 months

User's image In your configuration:

Retention Period: 365 days
Retention Action: Move items to archive

This means that any email older than 365 days will be automatically moved to the Online Archive mailbox.

You can assign a custom name to the retention tag or policy, such as:

-Move items older than 12 months

-Archive emails after 365 days

However, the name does not affect behavior; the actual processing is controlled by the configured retention period.

Regarding the previous issue where “Move emails older than 12 months” did not work as expected, common causes include:

-The archive mailbox is not enabled

-The retention policy is not assigned correctly

-The policy has not yet been processed

Reference: Retention tags and retention policies in Exchange Online | Microsoft Learn.

I hope this information is helpful.

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Answer 3

Exchange Online retention and archive policies do not support specifying an absolute calendar date range (for example, “01.01.2025 to 31.12.2025”) in the policy name or settings.

Retention and archive policies work only with age-based rules such as “older than 12 months.” The retention age is calculated from the date of delivery (or creation for unsent items), and when that age is reached, the Managed Folder Assistant moves or deletes the item according to the retention tag.

Therefore:

A policy can be configured as “Move items older than 12 months to archive,” but it cannot be configured as “Move items between 01.01.2025 and 31.12.2025.”
The policy name is just a label; it does not control behavior. The behavior is controlled only by the retention tag settings (age limit and action).
To target a specific date range, items must be selected and moved using search (for example, by Received date) rather than by a retention policy.

If a previous “Move emails older than 12 months” policy did not work as expected, possible causes include:

The mailbox was under 10 MB, in which case the Managed Folder Assistant does not run automatically and must be triggered manually with Start-ManagedFolderAssistant –Identity <mailbox>.
The mailbox’s associated user account was disabled (and not a shared mailbox), in which case MRM does not move items to the archive mailbox.

For ongoing automatic archiving, configure an MRM retention policy with appropriate age-based archive tags (for example, “Move to archive after 1 year”) and assign it to the mailbox. Use the policy name only as a descriptive label, not as a place to define a date range.

References:

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Mail Archiving Issue

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