Lately the company I work for has dealt with a number of clients/distributors who can not open our dwg drawings because they still have an older version of Autocad, and so usually my day starts with a couple emails of "This file need saved as an older version so XXX can open it." I tried to remedy this by saving as dwf's, but then we started getting problems of "we can't open these, we don't have a dwf viewer", even though we let them know that the dwf viewer is free (not to mention so is a dwg viewer that can open the new formats).
My question is how have all of you, my fellow drafters, dealt with the format not working in older versions, and other companies not updating or downloading the files they need. As of right now we either save as an older version or export as pdf.