QB Issue Resolution:

Was your QuickBooks 2010 fully updated to version R4? If not, please launch 2010 and choose QuickBooks->Check for Updates. Then apply the update.

Once that is done, try reimporting the QuickBooks Pro 7 file. I think that will fix it. Of course anything entered already in 2010 won’t be in the newly upgraded file.

Resolution for Issue 'All of my customer notes have disappeared. Any idea how to get them back?' available: Yes (Solved).
Source: Intuit Community forum.

All of my customer notes have disappeared. Any idea how to get them back?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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