ShareBridge

ShareBridge is a Windows application that bridges the built-in Windows Share sheet to Outlook Classic. When you share a file, image, or text from any app using the Windows Share sheet, ShareBridge intercepts it and opens a new Outlook Classic compose window with the shared content attached — ready to send.

Features

• Windows Share Target – appears as "Share to Outlook Classic" in the Windows Share sheet
• Multiple content types – supports files (images, PDFs, and more), bitmaps (screenshots from Snipping Tool), and plain text
• COM automation – integrates with Outlook Classic via COM late-binding; no extra interop packages needed
• Configurable – optional default subject, body, retention period for temp files, and error display settings
• Packaged as MSIX – installs as a modern Windows app; no administrator access required

Requirements

• Windows 10 version 17763 or later (Windows 11 recommended)
• Microsoft Outlook Classic installed
• .NET 10 Desktop Runtime (included via self-contained build)

Installation

From a GitHub Release

1. Download the .msix and ShareBridge.cer files from the latest release.
2. Install the signing certificate so Windows trusts the package:

   Import-Certificate -FilePath ShareBridge.cer -CertStoreLocation Cert:\CurrentUser\TrustedPeople

3. Double-click the .msix file (or run Add-AppxPackage ShareBridge_*.msix) to install.
4. After installation, open the Windows Share sheet from any app and select Share to Outlook Classic.

Build and Install Locally

.\scripts\build-and-install.ps1

This script creates a local self-signed certificate, builds the MSIX package, trusts the certificate, and installs the app — all without administrator privileges.

Configuration

Settings are stored in %LOCALAPPDATA%\ShareBridge\settings.json and are created on first launch with sensible defaults.

Setting	Default	Description
Destination	"outlook-classic"	Share destination (only Outlook Classic is currently supported)
TempFileRetentionHours	72	How long (in hours) to keep temporary share files before cleanup
DefaultSubject	""	Pre-filled subject line for new emails
DefaultBody	""	Pre-filled body text for new emails
AttachFiles	true	Whether to attach shared files to the email
ShowSuccessWindow	false	Whether to show a notification after a successful share
ShowErrors	true	Whether to show an error window when a share operation fails

Project Structure

ShareBridge.sln
├── ShareBridge.App/          # WinUI 3 MSIX app (net10.0-windows10.0.22621.0)
│   ├── Services/             # Core logic: share activation, Outlook integration, temp files, logging
│   ├── Destinations/         # Share destination implementations
│   ├── Models/               # Data models (SharedPayload, SharedFile, settings)
│   ├── Interfaces/           # Service abstractions
│   └── Package.appxmanifest  # Windows app package manifest
└── ShareBridge.Tests/        # xUnit tests for platform-independent logic (net10.0)

Contributing

Contributions are welcome! Please open an issue or pull request.

When working in this repository the CI will verify that:

• The project builds on Windows (dotnet build)
• All tests pass (dotnet test)
• Code is formatted correctly (dotnet format --verify-no-changes)

License

MIT