Here's a comprehensive document section you can include in your deliverables to describe the supported system requirements, Microsoft Outlook compatibility, and troubleshooting steps for your Windows application that automates Outlook email creation using Microsoft.Office.Interop.Outlook.

---

✅ Supported Environment for Outlook Email Integration Tool

This document outlines the prerequisites and system requirements necessary for successful operation of the Outlook Email Integration Tool, which programmatically composes and displays an Outlook email using the Microsoft Outlook Interop library.

---

🖥️ Supported Operating Systems

• Windows 10 (64-bit)
• Windows 11 (64-bit)
• Windows Server 2016 or later (with desktop experience)

Note: The application must be run in a user context with access to the Outlook desktop application. Outlook must be installed and configured for the currently logged-in user.

---

📧 Supported Microsoft Outlook Versions

Your application references Microsoft.Office.Interop.Outlook v15.0.0.0, which corresponds to Outlook 2013. However, due to COM interface stability, it is generally compatible with the following:

Outlook Version	Status
Outlook 2013 (32/64-bit)	✅ Fully Supported
Outlook 2016 (32/64-bit)	✅ Supported
Outlook 2019 (32/64-bit)	✅ Supported
Outlook 2021 (32/64-bit)	✅ Supported
Outlook for Microsoft 365 (32/64-bit Desktop)	✅ Supported
Outlook Web App (OWA)	❌ Not Supported
Outlook (UWP/Store App)	❌ Not Supported

⚠️ Important: This tool will not function if only the Microsoft Office Web Apps or Windows Store (UWP) version of Outlook is installed.

---

🔧 Required Components

• Microsoft Outlook Desktop App must be installed and activated.
• Microsoft Office Primary Interop Assemblies (PIAs) must be installed. These are typically included automatically with Outlook installations.
• Your application must target a matching bitness (32-bit or 64-bit) as Outlook, or be built using AnyCPU with Prefer 32-bit disabled and Embed Interop Types = True.

---

🔐 Permissions & Execution Context

• The app must be executed by a user with an Outlook profile configured.
• User must have Outlook open or be able to launch it (not blocked by group policy).
• User must have permission to send emails via Outlook.

---

⚠️ Common Issues and Troubleshooting

If the email fails to open, the following troubleshooting steps can help resolve the problem:

1. ✅ Confirm Outlook Is Installed

• Run outlook.exe from Run dialog (Win + R). If it doesn't open, Outlook is not installed or misconfigured.

2. 🧰 Verify Interop Support

• Make sure the following file exists: C:\Program Files (x86)\Microsoft Office\Office15\MSOUTL.OLB (for Outlook 2013) or corresponding version path for other Outlook versions.

• Confirm that Microsoft.Office.Interop.Outlook is installed and registered: Open PowerShell and run:

  Get-ItemProperty "HKLM:\SOFTWARE\Classes\Wow6432Node\CLSID\{0006F03A-0000-0000-C000-000000000046}" | Format-List

3. ⚙️ Check COM Access

• Run the application as the same user who is logged into Outlook.
• Ensure DisplayAlerts or antivirus/security software is not blocking Outlook automation.

4. 🛑 Debug Error Message

If the app returns: "Failed to open Outlook New Email":

• Outlook may not be properly registered in the system.
• Try repairing the Office installation.
• Check Event Viewer under Windows Logs > Application for any .NET or Outlook-related errors.

5. 🔄 Re-register Outlook

If automation fails, re-register Outlook using:

"C:\Program Files\Microsoft Office\root\Office16\Outlook.exe" /regserver

Replace the path with the actual Outlook version path on the user's machine.

---

🧪 Test Script (Manual Check)

To test if Outlook automation is available:

1. Open PowerShell or a .vbs file with:

   Set o = CreateObject("Outlook.Application")
   Set m = o.CreateItem(0)
   m.Subject = "Test"
   m.Body = "Interop test"
   m.Display

2. If the email displays, COM automation is functional.

---

📋 Summary

Requirement	Description
Outlook Desktop App	Must be installed & configured
Supported Versions	Outlook 2013, 2016, 2019, 2021, M365 Desktop
Interop Library	Microsoft.Office.Interop.Outlook v15.0.0.0
OS Compatibility	Windows 10/11/Server 2016+
Bitness Compatibility	Match Outlook's bitness
Not Supported	Web-only, UWP/Store versions of Outlook

---

Let me know if you'd like this turned into a Word or PDF doc.