A quick fix for the QuickBooks EWS UEXP Error is to re-establish the link between QuickBooks Desktop and Microsoft Outlook. Begin by opening QuickBooks, navigating to Preferences, and verifying email settings. If they’re correct, check your Outlook profile and ensure it’s set as default. Clear any outdated cache files, update both QuickBooks and Outlook, and retry sending an email. This method often resolves the error in minutes, restoring your ability to send documents directly.