we cannot fix outlook 2010 but in the report you still get all information. only the graph is not displayed.
these reports does not go to users, only admins. I suggest you use a more feature rich email client if you want these graphs.
another thing: make sure you configure the daily spam reports for users to NOT use the default report template. the buttons are also not working in outlook 2010 - there is a special template for outlook 2010.