Fixing Error Code 0x800706ba: RPC Server Unavailable During Office 2021 Installation

Address the error code 0x800706ba, which indicates an RPC server availability issue, with these steps to ensure a successful installation of Office 2021:

1. Restart Your Computer: Begin by restarting your computer. A reboot can resolve temporary service disruptions that might be causing this error.
2. Verify RPC Service Status: Press Windows key + R, type 'services.msc', and hit Enter. Scroll to find 'Remote Procedure Call (RPC)' and ensure it is running. If not, right-click and select 'Start'.
3. Set RPC Service to Automatic: Right-click on 'Remote Procedure Call (RPC)' in the Services window, choose 'Properties', and under the 'General' tab, set 'Startup type' to 'Automatic'.
4. Configure Windows Firewall: Open the Run dialog again with Windows key + R, type 'firewall.cpl', and press Enter. Go to 'Allow an app or feature through Windows Firewall' and confirm that 'Remote Assistance' and 'Remote Desktop' are enabled.
5. Temporarily Disable Antivirus Software: Third-party antivirus programs can block necessary network communication. Disable your antivirus temporarily and attempt the installation again.
6. Utilize the Office Installation Troubleshooter: Microsoft offers a troubleshooting tool specifically for Office installations. Visit the Microsoft support website, download, and run this tool to resolve common installation issues.

Following these steps should help you overcome the RPC server unavailable error and allow for a smooth installation of Office 2021.