The QuickBooks diagnostic tool assists the QB users and the professionals in settling the unwanted bugs. This tool is an essential feature that can be easily availed by QB users. A large number of errors can be easily resolved with the help of the QuickBooks connection tool, which includes QuickBooks H-series, or -6000 series errors that are generally encountered while opening the company file. However, the fact that matters over here is that this tool is compatible only with Microsoft Windows 7, Windows Vista, or Windows XP with QuickBooks 2008 and the later versions.