O365 log ingestion issue impacting some accounts with delay and log degradation alerts.

Summary AI Generated

Barracuda Networks experienced a 35-hour O365 log ingestion failure affecting a subset of accounts, leaving impacted customers without logs for approximately 3 days and triggering log degradation alerts. The root cause was traced to a Microsoft service issue (advisory MO1471241) on September 13, which created a large backlog that overwhelmed XDR backend processing after Microsoft restored their service. The backlog was fully processed and the incident resolved on September 20, though affected customers may have received alerts generated from the delayed historical data during recovery.