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Compare any report across every client you look after.
5 devices need a look. To remove a device someone no longer uses, or a leaver's, open the Exchange admin centre, Recipients > Mailboxes > the mailbox > Mobile devices, and remove it (or block it there first). Waiting devices are allowed or blocked in the same place.
Built from each client's latest collection with the same report as the client's own page. Select a client's name to open its report.