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Item Breakdown by Size
OverviewOn-Premises Office 365
Gauging the amount of oversized items stored in users' mailboxes is about as simple as it gets: select mailboxes, group them by Mailbox, Department or any other attribute depending on the outcome you want to achieve , and get a histogram showing the distribution of Outlook items by custom size intervals.
Use this report to find out why and where mailbox size is growing.
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