STATUS UPDATES & KNOWN ISSUES
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Office 365 Email Delivery Delays - 02/03/2021
As of about 5PM EST, multiple clients have reported extensive delays when sending & receiving email. Email messages are successfully being sent and received, but actual delivery time is lagging behind by at least 15 - 45 minutes. The root cause is unknown at this time, but the issue appears to be widespread across multiple Office 365 tenancies, both large and small.