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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Obviously I cannot tell you what happened from just a reddit post, but from what you wrote it seems that the attacker might have discovered your executive's password from some leak and modified the user's outlook rules through the (I assume) publicly exposed MAPI functionality. Even with MFA enabled you can still bypass it with tools like Ruler.
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