We have many older applications on our systems, that either are not compatible with Win7, even in 'compatibility mode', or would require re-activation with the vendor, which would require either new licenses (send money, please), or is not possible due to the licensing servers no longer being available (Vendor stopped supporting the app). There are no replacement apps for these, either. Also, some of these same older apps that 'shell' out to Internet Explorer will not work with anything above IE6. We fall in the 'not broken, does the job, leave it alone' category.