From time to time all Microsoft web applications (like CloudExtend) may end up sending too many requests to their destinations. For users on Microsoft Windows this typically happens when something called the Desktop Web App Viewer is consuming too many resources or you are not running the most recent version of the Web App Viewer.
How To Fix It
If this is a constant issue for you and ending the process as described below only works temporarily then it's likely that you need to update the viewer of the browser that renders the application. Try the steps below first and if the issue reoccurs see this section to learn how to install the new viewer.
🤷🏽 --> If the steps below are not clear for you the closing Outlook and rebooting your computer will also work.
Open “Task Manager “(Ctrl-Shift-Esc), find ”Desktop App Web Viewer“ or "Microsoft Edge WebView2" processes and kill them:
right-click → ”End task” (Temporary workaround when freezing happens)
Open Outlook again
How to 'end task' the Desktop App Web Viewer process'
How to 'end task' the Microsoft Edge WebView2 process'
Solving the problem if the issue occurs regularly
Users on updated versions of Windows 10 and Microsoft 365 typically have Edge used to render their add-ins and it is possible that the Desktop App Web Viewer is corrupted. Watch the video or follow the written steps to resolve.
Navigate to Microsoft's download site
https://developer.microsoft.com/en-us/microsoft-edge/webview2/ and click the download link under Evergreen Bootstrapper to download the WebView2 Runtime.
Follow the installation prompts to install
Restart Outlook and CloudExtend
Verify the add-in loads. If you're still having issues contact support using the chat icon at the bottom of this window.