ERROR_DS_DUP_MAPI_ID 0x800720BC

Error code 8380 · HRESULT 0x800720BC

WINDOWS

Schema update failed: duplicate MAPI identifier.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_DS_DUP_MAPI_ID is a Windows error code (system error 8380, returned as HRESULT 0x800720BC) reported by Windows. Its official message is: “Schema update failed: duplicate MAPI identifier.”

How to fix ERROR_DS_DUP_MAPI_ID

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_DS_DUP_OIDERROR_DS_DUP_SCHEMA_ID_GUIDERROR_DS_DUP_LDAP_DISPLAY_NAMEERROR_DS_DUP_RDNERROR_DS_NOTIFY_FILTER_TOO_COMPLEXERROR_DS_SEMANTIC_ATT_TESTERROR_DS_SUBTREE_NOTIFY_NOT_NC_HEAD

Source: Microsoft WinError.h

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