Archive mailboxes (called an In-Place Archive in Exchange Online) help people in your Office 365 organization take control of messaging data by providing additional email storage outside of their default mailbox.
The Archive Mailbox Sizes report shows you how much mail is stored in each users In-Place Archive Mailbox.

This report can be filtered to show you only the Archive Mailbox Sizes for a subset of users, such as those in a particular department or country.
Information about users Archive Mailboxes is also available in the Custom Report and in the User Details page for each account as shown below.

Print Friendly, PDF & Email