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How to Count Emails in a Microsoft 365 Business Mailbox

Elise Williams Sep 29, 2026 868 views

Question details

The user wants to know how to count the total number of emails in a single Microsoft 365 mailbox or how to retrieve email and mailbox counts across an entire organization.

How to Count Emails in a Microsoft 365 Business Mailbox

Product: Microsoft 365
Device & OS: not provided
Scenario: Counting total emails or mailboxes for reporting, auditing, or personal inbox management purposes.
Observed behavior: Users need to find the total message count within specific Outlook folders or use admin tools to retrieve organization-wide email statistics.

Before you start

Determine whether you need to count emails for a personal mailbox or across the entire organization, as organization-wide reporting requires Microsoft 365 administrator credentials.

Solution 1Recommended

Count Emails Using Outlook Folder Properties

Ideal for individual users who need to check the total number of emails within specific folders in their own mailbox.

By default, Microsoft Outlook displays the number of unread messages next to a folder. You can easily modify the folder settings to display the total number of items instead.

Open folder properties

Launch Microsoft Outlook and locate the folder you want to count (e.g., Inbox) in the left navigation pane. Right-click the folder and select 'Properties' from the context menu.

Change display settings

In the General tab of the Properties window, select the 'Show total number of items' radio button instead of the default 'Show number of unread items'.

Apply changes

Click 'Apply' and then 'OK'. The total number of emails will now appear in brackets next to the folder name.

Count Emails Using Outlook Folder Properties

Subfolder limitations: This method only counts the emails in the selected folder. If you have subfolders, you will need to change the properties for each one individually.

Solution 2

View Mailbox Item Counts in Exchange Admin Center

Best for Microsoft 365 administrators who need to view email counts and mailbox usage for specific users across the organization.

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Frequently Asked Questions

Can I use PowerShell to count emails in Microsoft 365?

Yes, administrators can use Exchange Online PowerShell. By running the 'Get-MailboxStatistics' cmdlet, you can retrieve the 'ItemCount' property for specific mailboxes or generate a bulk report for the entire organization.

Why does Outlook only show unread emails next to my folder?

By default, Outlook displays the unread message count to help you quickly identify new emails. You can easily change this to show the total item count by right-clicking the folder, selecting Properties, and choosing 'Show total number of items'.

Is there a way to export email counts for all users in Microsoft 365?

Yes, admins can use the Microsoft 365 admin center's Reports section. Navigate to Reports > Usage, and select the Exchange mailbox usage report. From there, you can export the mailbox item counts and storage details to a CSV file.

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