This report will show you trends in emails sent and received. Here, you see the Activity chart, which shows a fairly typical pattern where email traffic drops noticeably over weekends:
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Exchange Email Activity Charts
Some things to watch out for here would be a noticeable change in the ratio between emails received and read, or a dramatic or atypical increase in the number of emails being sent. Any of these could indicate problems with spammers, mail bots, viruses, or malware. (The spike in data later can most likely be ...
