Outlook no longer working

I am no longer able to send and receive emails from Microsoft Outlook 365. Here is the error message:

Task 'dcbrc@ca.rr.com - Sending' reported error (0x800CCC67) : '  The server responded: 421 concurrent connection limit in AVG exceeded(pass:0, processes:OUTLOOK.EXE[99])'

Hello Barbara,
Thank you for contacting AVG Community support.
We'll certainly check and help you.
May I confirm if you've disabled AVG Internet Security and checked the issue? If haven't, then please do so using the following steps.

  • Kindly right-click the AVG icon in the notification area of your Windows taskbar, then in the menu that appears, click the green slider next to Protection is ON.
  • Click OK, stop to confirm that you want to disable all AVG protection.
  • The slider turns red (OFF), and all AVG components are disabled. AVG protection will re-enable automatically the next time you reboot your PC.
Thank you and keep us updated.

Hello Barbara,
Thank you for contacting AVG Community support.
We'll certainly check and help you.
May I confirm if you've disabled AVG Internet Security and checked the issue? If haven't, then please do so using the following steps.

  • Kindly right-click the AVG icon in the notification area of your Windows taskbar, then in the menu that appears, click the green slider next to Protection is ON.
  • Click OK, stop to confirm that you want to disable all AVG protection.
  • The slider turns red (OFF), and all AVG components are disabled. AVG protection will re-enable automatically the next time you reboot your PC.
Thank you and keep us updated.

We're glad to know that, Barbara. 
Thank you for updating the status. Have a great day. Stay safe!

Also, I had to remove McAfee Virus Scan. Even though I disabled McAfee, the software was still running in the background. As soon as I removed McAfee, AVG was able to run correctly and outlook worked properly again. Support agent from AVG helped me with this.