Event ID - 25

Event Id25
DescriptionA fatal error (0x8000ffff) occurred in an IExchangeEventSink while processing message MessageSubject
Event InformationAccording to Microsoft:

This issue may occur if the script is not monitoring the correct folder.

you run a script that looks for new mail messages (which are of type IPM.Note) against the Calendar folder,
the script will not open objects in that folder (which are of type IPM.Appointment).
Reference Linksevent id:25 soyrce:MSExchangeES

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