Outlook - Solution to Mail Storage Quota Alerts-Compiled version

Creation date: 8/17/2026 1:55 PM    Updated: 8/20/2026 4:11 PM   email outlook storage

Solution to Mail Storage Quota Alerts:


1.First, determine whether the alert is for an email quota or an online archive email quota.

When you receive a quota alert email, first determine whether it is a Mailbox quota alert or an Online Archives Mailbox quota alert. Verify the storage quota and be wary of spam and phishing emails.

1.Mailbox quota alert: As shown in the image below

To proactively check your Mailbox storage quota, click the [File] menu in the upper-left corner of the Outlook main window, as shown in the image below


2.Online Archives Mailbox quota alert, as shown in the image below:


2.Scenario 1: When your Mailbox storage space is full and your computer’s disk space is insufficient

Clean Up Outlook Conversations to Free Up Mailbox Space

https://bsl-support.jitbit.com/helpdesk/KB/View/101743288


3.Scenario 2: Your Mailbox storage space is full, you do not have Online Archives, and your computer’s disk space is sufficient

Solution:Outlook - create PST data files when mailbox is full

https://bsl-support.jitbit.com/helpdesk/KB/View/60825026-when-the-mailbox-is-full


4.Scenario 3: Your Mailbox storage is not full, but your Online Archives storage is full.

Simply delete the emails from your Online Archives.

5.Scenario 4: When your mailbox storage space is full, you have Online Archives, and there is sufficient space

—you can move files to your Online Archives.

Outlook Online Archive Feature Now Available

https://bsl-support.jitbit.com/KB/View/78772877


5.Temporary login method before resolution:

If you experience connectivity issues due to a storage space warning, you can temporarily access your email via Webmail.

https://outlook.office.com


6.General principles for backing up and cleaning up work email:

1. Delete unnecessary emails: Promptly delete advertisements, notifications, and duplicate emails.

2. Retain important business emails: Keep contracts, approvals, client communications, and other documents for long-term storage.

3. Regularly clean up attachments: Delete large, expired attachments to free up email storage space.

4. Comply with company policies: Do not arbitrarily delete emails related to compliance, audits, or legal requirements.

5. Do not use your company email account to register for unrelated websites or apps to avoid receiving spam.

6. Unsubscribe from unnecessary subscriptions to reduce distractions.