How to View All Microsoft 365 Mailbox Storage Usage at Once
Question details
Microsoft 365 administrators need to check the mailbox storage usage for all users simultaneously instead of opening each account individually.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Administrators want to monitor organization-wide email storage limits and generate a comprehensive mailbox usage report.
- Observed behavior
- The Microsoft 365 admin center provides a centralized reporting tool to view detailed mailbox usage data and storage metrics.
Ensure you are signed in with an account that has Global Administrator, Exchange Administrator, or Reports Reader permissions in your Microsoft 365 tenant.
View Mailbox Usage via Microsoft 365 Admin Center
Access the built-in usage reports in the Microsoft 365 admin center to analyze mailbox storage data for all users at once.
Log in to the Microsoft 365 admin center using your administrator credentials.
On the left navigation menu, expand the 'Reports' section and click on 'Usage'.
Scroll down to the 'Email activity' section and click on the 'View More' button.
From the drop-down list at the top, select 'Exchange' and then choose 'Mailbox usage'.
Click on 'Choose columns' to display additional information such as storage used, item count, and mailbox quota limits.
Reveal Concealed Usernames in Usage Reports
By default, Microsoft 365 conceals user identifiable information. Update your organization settings to display actual usernames in the reports.
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Frequently Asked Questions
Why does the mailbox usage report show random characters instead of usernames?
For privacy reasons, Microsoft 365 hides user, group, and site names by default. You can reveal the actual usernames by navigating to Settings > Org Settings > Services > Reports and disabling the privacy feature.
How often is the Microsoft 365 mailbox usage data updated?
The data in the mailbox usage reports is pulled from backend servers and generally reflects email activity from the past 24 to 48 hours. It cannot be forced to sync in real-time.
Can I export the Microsoft 365 mailbox usage report for further analysis?
Yes. While viewing the Mailbox usage report in the admin center, you can click the 'Export' link to download the data as a CSV file. You can then open this file in spreadsheet applications like WPS Spreadsheet to filter and analyze the storage metrics.
