While installing Office Online Server (OOS) on Windows Server 2022/2025, you may encounter the following error message early in the setup process:
“Unable to proceed due to the following errors: Product requires IIS 7.0 or higher, with ASP.NET v4.0.”
This error typically appears when the required IIS components and ASP.NET features are missing from your server. OOS depends on a web-based rendering engine and thus requires a properly configured Internet Information Services (IIS) environment along with .NET Framework 4.x support.
🧩 Root Cause
Even on modern Windows Server versions, these features are not installed by default. The setup checks for:
- IIS (Internet Information Services) version 7.0 or higher
- ASP.NET v4.0 under IIS
If any of these components are missing or not properly registered, the setup halts.
âś… Solution: Install Required IIS and ASP.NET Features
You can install the required components using PowerShell or Server Manager.
🔹 PowerShell (Recommended)
Run the following command in an elevated PowerShell window:
Add-WindowsFeature Web-Server,Web-Mgmt-Tools,Web-Mgmt-Console,Web-WebServer,Web-Common-Http,Web-Default-Doc,Web-Static-Content,Web-Performance,Web-Stat-Compression,Web-Dyn-Compression,Web-Security,Web-Filtering,Web-Windows-Auth,Web-App-Dev,Web-Net-Ext45,Web-Asp-Net45,Web-ISAPI-Ext,Web-ISAPI-Filter,Web-Includes,NET-Framework-Features,NET-Framework-45-Features,NET-Framework-Core,NET-Framework-45-Core,NET-HTTP-Activation,NET-Non-HTTP-Activ,NET-WCF-HTTP-Activation45,Windows-Identity-Foundation,Server-Media-Foundation
🔄 Re-run the Setup
Once the features are installed and the server is rebooted, re-run the Office Online Server setup. The error should no longer appear, and the installation should proceed smoothly.