What kind of files do you work with? Do they contain financial information that you track by date? Do you exchange any data files with a colleague or business? Do you rely on spreadsheet data files for household or business management? Are the dates in these files entered as two or four-digit years? Do any files you exchange with others contain important date-sensitive content?

Though the most vulnerable documents are those created in spreadsheet and database programs, consider all other types of documents as well. For example, it is possible for documents created by a word processing program to have tables that contain dates used in calculations. On the other hand, your word processing documents may be relatively unimportant letters or documents in which the date is static and cannot "trigger" anything to happen.