Message properties and search operators for In-Place eDiscovery …
https://learn.microsoft.com/en-us/exchange/security-and-compliance/in-place-ediscovery/message-properties-and-search-operators
Feb 21, 2023 · keyword1 AND keyword2: Returns messages that include all of the specified keywords or property:value expressions. + keyword1 +keyword2 +keyword3: Returns items that contain either keyword2 or keyword3 and that also contain keyword1. Therefore, this example is equivalent to the query (keyword2 OR keyword3) AND keyword1.
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