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0x000020BC

ERROR_DS_DUP_MAPI_ID

Schema update failed: duplicate MAPI identifier.

win32decimal 8380

Matched as: the code as given (hex)

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Source: System Error Codes (8200-8999) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09