One of the many QuickBooks features is QuickBooks Multi-User Mode, which enables many users to access the same company file from various workstations connected to a network. It's just as easy to access the company file in a shared network as it is on your PC. However, an issue occurs when QuickBooks cannot open the company file for any reason and displays the QuickBooks error H507. If you're receiving an error message with the Error Code H505, read the entire article for thorough troubleshooting tips.