This article provides the resolution to an issue where Marc.Store.exe causes high CPU usage over an extended period. There are Retention Policies, or Classification Rules configured that use a high amount of wildcards, e.g.,
subject contains *****SPAM*****.
This issue appears when using a high amount of wildcard characters, which cause processing to increase exponentially, therefore, increasing the high CPU usage.
To resolve this issue, edit the Retention Policies or Classification Rules that contain wildcard characters and reduce the number of them. For the example outlined above, change the criteria to
subject contains *SPAM*.