Know what the export can verify before you rely on it.

Product claims are limited to tested file structures and real fixtures. Unverified metadata stays Unknown or blocks the export.

SurfaceStatusEvidence

Word for WindowsValidatedNative saved fixture

Word for Mac / WebBest-effortNo native fixture yet

PowerPoint legacyValidatedSchema + round-trip

PowerPoint modernValidatedThreads + replies

Conservative export policy

Detected structures are never silently discarded. Unknown thread metadata remains Unknown, and unsupported PowerPoint comment schemas stop the workbook before a misleading partial result is created.

Browser-local processing

Office packages are opened, parsed, and converted to XLSX inside a dedicated browser Worker. Event payloads contain categories and counts, not document text, authors, comments, or file names.