It will actually depend on what report you're trying to export. If it is a report located under the File > Print menu, then those do not have the ability to be exported to a spreadsheet. However, if the report is under the expert > contact expert menu, then it should be possible to create a field export type document to pull the data from the report and into a .csv spreadsheet file.
I've attached a document to this reply with the basic steps of creating the field export document and attaching it to an expert report. If you have additional questions or would like assistance setting this up, let me know.