Legacy Office archives are rarely uniform. A folder may contain ordinary reports, macro-enabled templates, embedded objects, damaged files, hand-built charts, and documents that only ever opened correctly in one desktop Office version. A reliable migration therefore needs more than a loop that changes extensions.
Build the inventory first
Classify files by actual container and format, not only by extension. Record encrypted, damaged, password-protected, macro-enabled, or unusually large inputs separately. Decide which outputs are required: editable DOCX/XLSX/PPTX, read-only PDF, normalized text, or retention of the original.
OfficeIMO exposes format detection and normal load paths for the supported Word, Excel, and PowerPoint families. The public compatibility page summarizes the same operation-level contracts used to describe import, native writing, bidirectional conversion, preservation, and validation.
Analyze before a destructive migration
Use AnalyzeConversion(...) for Word, Excel, and PowerPoint when the destination must meet a defined fidelity policy. A finding can remain native, become an editable approximation, use a visual fallback, retain the source, or block the operation.
That distinction lets teams define practical rules:
- Routine documents may accept known editable approximations.
- Regulated records may require native representation or preserved source bytes.
- Presentation archives may accept visual fallback for unsupported drawing content.
- Financial workbooks may block any change to formulas, names, or calculation meaning.
Keep the original and the evidence
Do not delete the source merely because a destination file was created. Keep the original until validation is complete, and store the conversion report with the batch result when traceability matters. Use checks based on the business meaning of each family: paragraphs and section structure for Word, formulas and key values for Excel, slide counts and important visual elements for PowerPoint.
Desktop Office can be an optional independent validation oracle for high-value samples. It is not required by the OfficeIMO runtime.
Choose the focused routes
After modernization, use the normal Word, Excel, and PowerPoint APIs for editing, reporting, review, or publishing.