Use this report to find out which mailboxes are too large, inactive, or beyond their storage quotas.
Monitor mailbox size variations
Measuring the increase in mailbox size is not an easy task as Exchange does not keep a history of it. You can overcome this limitation with Promodag Reports and this article explains how to do it.
List stale recipients in Exchange
This post explains how to detect inactive Exchange recipients such as mailboxes, distribution groups or contacts in on-premise Exchange or Exchange Online. This work can be particularly useful if you are planning to migrate to Office 365 in the near future or if you simply want to clean up your directory.
Report Sample: Top 5 Mailboxes Grouped By Organization Type
This report shows the top five Office 365 and on-premises mailboxes in a hybrid environment.
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