How can I fix the error QuickBooks unable to send emails to Outlook? 1-855-409-2300 If QuickBooks unable to send emails to Outlook, start by ensuring both programs are updated to their latest versions. Check if Outlook is set as the default email application in Windows settings. Next, restart both QB and Outlook to refresh their connections. If the issue persists, try repairing the Outlook installation through the Control Panel. You can also try reinstalling the QB Email service through the QB Tools Hub. Additionally, ensure that your email preferences in QB are configured correctly. If these steps don't resolve the issue, contacting QB support or consulting with an IT professional may be necessary for further troubleshooting.