Microsoft Office 365 missed 9.3% emails containing spam, phishing, and malware. Cyren analyzed 10.7 million emails forwarded by Office 365 to user mailboxes for companies tested. Researchers found 957,039 emails, or 8.93% of all email traffic, turned out to be spam. 34,077 emails delivered to Office 365 users were phishing messages. Of the messages evaluated, 9.75 million (90.7%) were found to be clean.”]
Source: https://www.darkreading.com/cloud/office-365-missed-34-000-phishing-emails-last-month