Hey there Mac_Stealth,
Welcome to Apple Support Communities. We'll be happy to look into why you can't import or export from Outlook on your Mac.
If you don't run into any other Mail related issues, it may be an issue with the download or program you're using. If that is the case, reaching out to Microsoft may be the best option.
To start, make sure you have the latest compatible versions of Outlook and macOS, for your device. This resource can guide you: Update macOS on Mac - Apple Support
If the behavior continues, uninstall and reinstall the affected program and test again. If that doesn't improve it, reach out to the Developer for further assistance.
Take care.