Critical-risk tools in M365
9 of the 85 tools in M365 are classified as critical risk. This page profiles those tools specifically, with recommended policy actions and the attack patterns that target them.
Every operation listed below is an action PolicyLayer recommends controlling at the transport layer. Open any tool to see the full profile, risk score, and YAML policy snippet.
Tools at critical risk
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calendar_delete_calendarDestructivecalendar_delete_calendar
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calendar_delete_eventDestructivecalendar_delete_event
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contact_deleteDestructivecontact_delete
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email_deleteDestructiveemail_delete
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emailfolders_deleteDestructiveemailfolders_delete
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emailfolders_emptyDestructiveemailfolders_empty
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emailrules_deleteDestructiveemailrules_delete
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file_deleteDestructive🔴 Delete a OneDrive file or folder permanently (always require user confirmation)
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folder_deleteDestructivefolder_delete
Attacks that target this class
Critical-risk tools in any server share these documented attack patterns. Each links to the full case and the defensive policy.