a fax conversion system for determining a measure of the number of pages transmitted by fax to or from a plurality of users , comprising : means for converting the transmitted pages into a format that can be output electronically rather than in hardcopy , means for counting the number of pages within an individual fax transmission , means for associating said fax transmission with a respective one of said plurality of users , and means for determining a measure of the total number of pages transmitted by fax to or from each of said plurality of users . the system may determine a measure of an equivalent number of trees saved , or the number of carbon credits gained , by not producing hardcopies of transmitted pages .