Microsoft 365 management, reporting, and auditing - ManageEngine M365 Manager Plus (2024)

The default size of Microsoft 365 mailboxes varies based on the mailbox type and user subscription. The default size of a user mailbox is either 50 GB or 100 GB, and when the space is exhausted, users won't be able to send or receive emails.To avoid this, admins need to keep a check on the mailbox size.

For this purpose, Microsoft 365 Admin Center provides Mailbox Usage report. (Microsoft 365 Admin Center → Reports → Usage → Select a report → Exchange → Mailbox Usage)

The Mailbox Usage report provided by the Admin Center shows only the storage space consumed by user mailboxes. To view the actual user mailbox size, shared mailbox size, resource mailbox usage, and other mailbox related details you have to navigate to the Exchange Admin Center (EAC).

M365 Manager Plus' Mailbox Size reports

M365 Manager Plus has a dedicated set of reports to gain insights on mailbox usage. Some of the reports include,

• Mailbox size
• Mailbox size restriction
• Current mailbox size vs quota
• Archive mailbox size
• Mailbox storage information
• Shared mailbox size
• Room mailbox usage

Apart from the aforementioned reports, the toolalso provides reports thatprovide every day mailbox usagestatistics. Unlike Microsoft 365 Admin Center, M365 Manager Plus reports on all types of mailboxesfrom a single window.

Steps to view the Mailbox Size report

1. Login to M365 Manager Plus.
2. Go to theReports tab.
3. Navigate toExchange Online → Mailbox Reports in the left pane.
4. Under theSize Reports category click onMailbox Size report.

Note: To viewShared Mailbox SizeandRoom Mailbox Usage reports navigate toExchange Online → Other Exchange Reports in the left pane.

M365 Manager Plusvs Microsoft 365 Admin Center

• Pre-defined reports:M365 Manager Plus provides more than 100 pre-defined reports on Exchange Online mailboxes while the Admin Center provides relatively few reports.
• Data older than 180 days:Reports provided by Microsoft 365 Admin Center does not show data older than 180 days.In M365 Manager Plus all the data rightfrom the dayof installation can be viewed without any restriction.
• Customize reports:M365 Manager Plus allows you to create your own report based on your organizational requirements. However, the Admin Center lacks such flexibility.
• Schedule reports:All the reports of M365 Manager Plus can be scheduled to be generated at specified intervals and have them delivered to your inbox via email.
• Export reports:M365 Manager Plus exports reports to CSV, XLSX, PDF or HTML formats, while the native portal exports only to CSV format.

Read more about the Microsoft 365 reporting featurehere.