Use this report to find out if distribution groups are really being used.
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.
Sample Report: Used Groups in 2021
This example report shows the distribution groups used in 2021 with the Display Name of the last user.
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