Have you ever been able to export this report properly to Excel? In other words, is this an ongoing process that failed for a specific set of data this time? Or is this a new thing you're trying to do for the first time?
Access does not "use" any specific version of Excel. You can export DATA to Excel in a number of different formats so that may or may not be relevant to the problem.
In order to understand -- and possibly offer suggestions -- it would be very helpful to have the FULL context, including the specific VBA you are using to export this report.
Thanks.