Thanks for joining this thread and alerting us about your invoice issue, Edwin. Let me share information about the QuickBooks Desktop (QBDT) operating system and other requirements.

At this moment, we can't provide a timeframe for QBDT 2021's full compatibility with Windows 11. However, we'll share information as soon as the compatibility certification process is complete.

Also, you mentioned you got an error message when attempting to email invoices. Can you share the exact error with me? This way, I can provide accurate solutions for you.

Concerning reinstalling Windows 10, yes, you can. Furthermore, QBDT 2021 requires the internet security protocol TLS 1.2 for the connected services to work smoothly. If you haven’t run this tool yet, I recommend you do so. This helps ensure you’re able to email invoices without any interruptions.

You can read these resources to get insights on what your computer needs for the best experience:

• Understand QuickBooks Desktop Compatibility with Beta Operating Systems
• System Requirements for QuickBooks Desktop 2021

If you have any other queries or concerns managing your program, please don’t hesitate to let us know. We’ll always be here to help you out, Edwin.