After upgrading company files to a new version of QuickBooks, QuickBooks cannot find the [company name] data file or some of the company information is missing. This can also happen after making a backup, making an accountant's copy, running the Verify Data utility, or with other functions in QuickBooks.
It is unusual to lose only some of the data during an upgrade to a new version of QuickBooks or when running other functions in the program. Usually, if something goes wrong during one of these operations, all data will be lost.
Lost or missing [company name] data files usually occurs for one of the following reasons: