Since upgrading my users from Excel 2000 to 2002 (XP) they are prompted with the following message: "The file 'whatever.xls' may have been changed by another user since you last saved it. In that case, what do you want to do?" Save a copy or overwrite changes. There is no other user in the file and in many cases the file has never been opened by any other user. Has anybody else seen this and if so is there a solution?