I am creating a report using report designer client and setting a formatting such as "font family" = Courier New and "font-size"=14.
Exporting it using the report designer Run -> Excel /Excel 2007, the output file will have the formatting changed.
Excel file -> one of the header column font changes to "Arial" and "font-size" to 10.
Excel 2007 file -> one of the header column font changes to "Calibri" and "font-size" reduces to 10.
Report and the output files attached.