Windows 11 provides significant security enhancements, provided your machines meet the hardware requirements. Having been hit by ransomware in the past, we were highly motivated to move to Windows 11. Unfortunately, after the "no go-back" period, we started experiencing "Lost connection to the company file" errors. We are running in single-user mode, QBDT Non-Profit Premium 2021. We have tried every posted technique we could find to fix the problem, but we have not had any success. A call to QB tech support reveals they have been working on this since Oct 2021 and have no solution. Not even a recommendation to migrate to QB 2022. Fortunately, we have a spare PC with Windows 10 and we will transfer QB 2021 to it. The error occurs randomly within an hour of opening a company file, forcing QB to close.
