Steps to reproduce

1. Attach both the files attached to this bug report:
   • star_port_usage_graph.xls
   • star_port_usage_graph.xlsx
2. Enter the following in Confluence Page:

   h3. Office 2007
   {viewfile:star_port_usage_graph.xlsx}
   -----
   h3. Office 2003
   {viewfile:star_port_usage_graph.xls}
   

Result

1. Office 2007 version of the excel seems to render the chart differently compared with Office 2003 version in Confluence (The right y-axis is missing in 2007 version):
   • Screenshot of star_port_usage_graph.xlsx
   • Screenshot of star_port_usage_graph.xlsx