# Open Email with Outlook Web Access (OWA)
Updated 19 March 2026, based on Epona365 Office version 25.1
Epona365 Web already supports opening filed e-mail documents in Outlook Web Access (OWA). This same functionality is now available in Epona365 Office.
When browsing to a matter in the Epona365 Office side panel in Outlook, right-clicking on an e-mail document (.msg or .eml) and choosing Open document will open the e-mail in OWA. For non-e-mail documents, the Open document action continues to open the document in the SharePoint browser.
# How it works
- Navigate to a matter in the Epona365 Office side panel
- Right-click on an e-mail document (
.msgor.emlfile) - Select Open document from the context menu
- The e-mail opens in Outlook Web Access (OWA)
Epona365 Office first checks if the e-mail already exists in the user's mailbox by matching the Internet Message ID. If found, the existing message is opened directly in OWA. If not found, the e-mail is temporarily imported into the mailbox, opened in OWA, and the temporary copy is automatically cleaned up after the dialog is closed.
# Requirements
- Epona365 Office 25.1 or higher
- Microsoft Graph Mail.ReadWrite permission (delegated)
- Microsoft Office License
Remark: the same Mail.ReadWrite permission is used by Epona365 Web OWA integration. If the permission was already approved for Epona365 Web, it may already be available for Epona365 Office.
# Configuration
# Grant the Mail.ReadWrite permission
- Navigate to the API Access portal: https://{yourtenantname}-admin.sharepoint.com/_layouts/15/online/AdminHome.aspx#/webApiPermissionManagement (opens new window)
- Locate the Microsoft Graph, Mail.ReadWrite permission request for the Epona365 Office application
- Select the request and click Approve
Remark: if the permission request does not appear, verify that the Epona365 Office containers have been updated to a channel that includes this feature.
# Fallback behavior
If the Mail.ReadWrite permission is not granted, the Open document action will fall back to the previous behavior and open the e-mail in the SharePoint browser.