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The default size of Office 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).
O365 Manager Plus has a dedicated set of reports to gain insights on mailbox usage. Some of the reports include,
Apart from the aforementioned reports, the tool also provides reports that provide every day mailbox usage statistics. Unlike Microsoft 365 Admin Center, O365 Manager Plus reports on all types of mailboxes from a single window.
Note: To view Shared Mailbox Size and Room Mailbox Usage reports navigate to Exchange Online → Other Exchange Reports in the left pane.
Read more about the Office 365 reporting feature here.
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