Network errors such as error -6000, -80: "An error occurred when QuickBooks tried to access the company file," can occur when restoring a QuickBooks company file from a backup, updating a company file, or attempting to open a company file.

Steps to resolve problems when attempting to email, create, or print a PDF file, or to reconcile your accounts. This can result from compatibility issues between the QuickBooks PDF Converter and settings on certain 64-bit versions of Microsoft Windows Vista or Windows XP.

This error occurs when opening a company file located on a Novell server. There is no resolution at this time but the article does offer some best practices for installing the QuickBooks server.