I have 85 Excel .xls files, each with 7 identically named sheets (or tabs). How can I combine these 85 files into one .xls with the same 7 tabs (and the information from the individual files 'stacked' together). The tabs are named the same thing in each .xls, however the data is not identical - some tabs have extra columns. I'm looking for quick & dirty. I can go in and clean up headers later. I'm not averse to buying software if there is something out there that you have used and know can do this.