Problems such as these occur when Outlook is running in the background. Press CRTL ALT DELETE and open use your app manager to stop Outlook from running before trying to continue.

You can update in numerous way. Start by getting your hands on any version of Outlook On Desktop, and visit the menu once the software is installed. Click the option that says, “Check for Updates,” and update your program that way. You may also visit the official Outlook On Desktop website and download the most modern version, but this is more difficult than simply checking for updates via the software itself.

Some people are simply unable to install and use OOD. There are many reasons, and some of them are solvable, but your best course of action is sometimes a complete reinstall of Microsoft Office. Your other options include trying to find a solution via online forums, or simply giving up on the idea of using Outlook On Desktop.