Is the error QuickBooks Outlook is not responding occurring for you? The most common causes of this problem are out-of-date software, improper email settings, or broken Outlook integration. To fix it, check email preferences, fix Office, and update QuickBooks and Outlook. For a more seamless emailing experience in QuickBooks, restart both applications after making changes. Contact a knowledgeable and amiable QuickBooks phone support agent by calling 1.855.738.2784.