It is amazing how many people use Excel for providing status updates, reference material, defect tracking, etc. I have made a number of solutions for Excel users that thought that Excel was just a bunch of cells that could do a few calcs for convenience (SUM, IF, Vlookup,etc.) I think the hardest thing about Excel is getting the users to understand that excel can do things better. For example: a users mantains a list of somekind with each record containing several attributes.