-|action|[microsoft.graph.security.caseAction](../resources/security-caseoperation.md#caseaction-values)| The type of action the operation represents. Possible values are: `contentExport`, `applyTags`, `convertToPdf`, `index`, `estimateStatistics`, `addToReviewSet`, `holdUpdate`, `unknownFutureValue`, `purgeData`, `exportReport`, `exportResult`. You must use the `Prefer: include-unknown-enum-members` request header to get the following values from this [evolvable enum](/graph/best-practices-concept#handling-future-members-in-evolvable-enumerations): `purgeData`, `exportReport`, `exportResult`.|
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