How to Use Copilot in Outlook to Detect and Forward Vendor Invoices

Manually scanning every email attachment for vendor invoices is time-consuming and error-prone. Copilot in Outlook can identify invoice attachments automatically and help you forward them to the correct department. This guide explains how to set up Copilot prompts that detect invoice-related emails and how to forward them with a single click. By the end, you will have a repeatable workflow that reduces manual sorting and speeds up accounts payable processing.

How Copilot in Outlook Handles Invoice Detection

Copilot in Outlook uses Microsoft Graph data and natural language processing to scan email content and attachments. When you ask it to find invoices, Copilot looks for keywords like “invoice,” “due date,” “total amount,” and file types such as PDF or image of a receipt. It does not read every attachment by default — it relies on your prompt to focus the search. You must have a Copilot for Microsoft 365 license, and your Outlook must be connected to a work or school account with Microsoft 365.

The feature works in the new Outlook for Windows, Outlook on the web, and Outlook for Mac. Copilot cannot access attachments in shared mailboxes unless you have delegate access. It also cannot detect invoices in encrypted or password-protected PDFs. These limitations are important to know before you set up the workflow.

Steps to Detect Vendor Invoices Using Copilot

1. Open Copilot in Outlook
   In the Outlook ribbon, select the Copilot icon. The Copilot pane opens on the right side of the screen. If you do not see the icon, go to View > Copilot to enable it.
2. Use a detection prompt
   In the Copilot pane text field, type: Find all emails from the last 7 days that contain invoice attachments. Copilot scans your inbox and returns matching emails. You can adjust the time range by changing “7 days” to “30 days” or “this month.”
3. Refine the search by vendor
   If you need invoices from a specific vendor, add the vendor name. Example: Find emails from Acme Corp with invoice attachments sent in the last 14 days. Copilot filters results by sender address and attachment content.
4. Review the results
   Copilot displays a list of matching emails. Each result shows the sender, subject, date, and attachment count. Click on any result to open the email in the main reading pane.
5. Verify the invoice details
   Before forwarding, ask Copilot to summarize the invoice. Type: Summarize this invoice email. Include vendor name, total amount, and due date. Copilot extracts the data from the attachment and displays it in the pane.

Steps to Forward Vendor Invoices with Copilot

Once you have identified the correct invoices, you can forward them directly from the Copilot pane. This method preserves the original attachment and adds a summary in the email body.

1. Open the invoice email
   Click the email that contains the invoice attachment. The email opens in the reading pane.
2. Use a forward prompt
   In the Copilot pane, type: Forward this email to accounts-payable@company.com with a summary of the invoice. Copilot creates a new email in the compose window. The original attachment is included automatically.
3. Edit the summary if needed
   Copilot inserts a short summary in the email body. You can add or remove text before sending. For example, add a note about the purchase order number if you have it.
4. Send the forwarded email
   Review the recipient address and the attachment. Select Send. The invoice is now forwarded with context for the accounting team.

Creating a Reusable Prompt Template for Invoice Forwarding

To save time, you can create a prompt template that you reuse every time you forward an invoice. This ensures consistency in the forwarded email format.

1. Write the template prompt
   In a text editor, write: Forward this email to accounts-payable@company.com. In the email body, include the vendor name, invoice number, total amount, and due date from the attachment. Attach the original invoice file.
2. Save the prompt in a note
   Paste the prompt into a Microsoft OneNote page or a sticky note on your desktop. Label it “Invoice Forwarding Prompt.”
3. Copy and paste when needed
   When you receive an invoice email, copy the template prompt from your note and paste it into the Copilot pane. Copilot follows the same instructions every time.

Common Issues and Limitations

Copilot does not detect invoices in shared mailboxes

Copilot can only scan mailboxes you have full access to. If you have delegate access to a shared mailbox, open the shared mailbox in Outlook first. Then use the same detection prompt. Copilot will scan the shared mailbox folder you are viewing.

Copilot returns no results for old invoices

Copilot searches your mailbox index. If the email is older than the index retention period set by your IT admin, Copilot may not find it. Ask your admin to confirm the data retention policy for Microsoft 365. For invoices older than 30 days, use Outlook search directly with the keyword “invoice” and file type filter.

Copilot cannot read password-protected PDF attachments

If a vendor sends an invoice as a password-protected PDF, Copilot cannot extract text from it. You must open the PDF manually, enter the password, and then forward it. Consider asking vendors to send unprotected PDFs or Excel invoice files.

Copilot generates incorrect summary details

If the invoice format is nonstandard, Copilot may misread the total amount or due date. Always verify the summary against the actual attachment before sending. You can train Copilot by providing feedback — select the thumbs-down icon in the Copilot pane and describe the error.

Copilot Pro vs Copilot for Microsoft 365: Invoice Features

Item	Copilot Pro	Copilot for Microsoft 365
Availability in Outlook	Yes, in new Outlook for Windows and web	Yes, in all Outlook versions
Attachment scanning	Limited to email bodies and basic attachment names	Full document understanding in Word, Excel, PDF
Prompt memory	No saving of custom prompts	Can save prompts via Copilot Lab or manual templates
Invoice data extraction	Basic extraction from simple PDFs	Advanced extraction from structured and semi-structured documents
Forward with summary	Yes, but summary may miss line items	Yes, includes line items and totals when available

Copilot for Microsoft 365 is the recommended option for accounts payable workflows because it reads attachment content more deeply. Copilot Pro works for simple invoice detection but may require manual corrections on forwarded summaries.

You can now detect vendor invoices in Outlook using Copilot prompts and forward them with a machine-generated summary. Start by testing the detection prompt on a small batch of recent emails. Once you confirm accuracy, save your forwarding prompt as a template for daily use. For advanced automation, explore Copilot integration with Power Automate to trigger invoice forwarding when a new invoice email arrives.