Automatic Outlook Invoice Monitoring with Gemini AI and Excel Integration

Finance teams and accounts receivable staff who handle incoming supplier invoices via email. This workflow checks Outlook emails hourly for new messages with attachments, uses AI to classify if they contain invoices issued to your company, extracts key details from PDF invoices using Gemini vision, and appends the data to an Excel sheet for review. Connect Microsoft Outlook, Google Gemini, and Excel credentials in n8n. Set the schedule trigger to run every hour. Update the Outlook folder ID, Excel workbook/worksheet IDs, and adjust AI prompts if needed. Test with sample emails. n8n workflow editor access, Microsoft 365 account with Outlook and Excel permissions, Google Gemini API key, an existing Excel workbook for data logging. Add duplicate detection to avoid reprocessing, integrate with accounting tools like QuickBooks, modify extraction schema for different invoice formats, or route data to other apps like Slack for notifications. Key Technologies: n8n,Microsoft Outlook,Google Gemini AI,Microsoft Excel,HTTP Request Node,LangChain Text Classifier Automation Value: Saves hundreds of hours per year on manual invoice sorting and data entry. Reduces errors in invoice classification and extraction through AI. Enables quick review in Excel before accounting entry. Scales to handle increasing email volumes without extra staff. Best Practices: Use AI early for classification to minimize resource use on irrelevant data. Use HTTP requests for advanced AI configs not available in native nodes. Include error handling (e.g., continueErrorOutput) to keep workflow reliable. Schedule polling instead of webhooks for easy time-based filtering. Merge email context with extracted data to maintain traceability. Test with varied invoice formats to refine AI prompts and schemas. Add deduplication nodes for production to avoid processing duplicates.