When opening, or restoring a backup of a QuickBooks Desktop 2006, 2007, 2008 or 2009 (QuickBooks Desktop Enterprise 7, 8 or 9) file in QuickBooks Desktop 2014, 2015, 2016 or 2017 (QuickBooks Desktop Enterprise 14, 15, 16, 17), you see the following error:We're sorry. QuickBooks couldn't open your company file.We'll try to fix the problem. Click Start to begin.If the problem continues, contact support for assistance and report error codes:(-6123, 0)What you can try nowIf you are encountering the error, and are NOT converting a QuickBooks Desktop 2006, 2007, 2008 or 2009 (QucikBooks Desktop Enterprise 6.0, 7.0, 8.0 or 9.0) file to QuickBooks Desktop 2014, 2015, 2016 or 2017 (or QuickBooks Desktop Enterprise 14.0, 15.0, 16.0 or 17.0) please see the following articles:If you are encountering the error, and are converting a QuickBooks Desktop 2006, 2007, 2008 and 2009 (QuickBooks Desktop Enterprise 6.0, 7.0, 8.0 or 9.0) file to QuickBooks Desktop 2014, 2015, 2016 or 2017 (QuickBooks Desktop Enterprise 14.0, 15.0, 16.0 or 17.0), you can try the following:

If you have a computer that has QuickBooks Desktop 2009, 2010, 2011 or 2012 installed, you should try converting or restoring the file in that version, before opening the file in the newer version of QuickBooks Desktop.

If you require one of the below trial links, please contact Technical Support

You can install QuickBooks Desktop Premier Accountant 2010 Trial to convert any QuickBooks Desktop Pro or Premier files, before opening the file in the newer version of QuickBooks Desktop Pro or Premier.

You can install QuickBooks Desktop Enterprise 12 Trial to convert any QuickBooks Desktop Pro, Premier or Enterprise file, before opening the file in the newer version of QuickBooks Desktop Enterprise.

Reinstall using a clean install of QuickBooks Desktop 2015, 2016 or 2017 (QuickBooks Desktop Enterprise 15.0, 16.0 or 17.0), and attempt the conversion immediately on opening that version of QuickBooks Desktop.