I must disagree. The form will not work properly in the majority of browsers now in use, because they do not (by default) use Adobe technology. In some cases the form won't be fillable, in some it might seem to be but ends up broken. This is a serious and growing problem.
By the way, your original question needs to focus on what you want to do with the form. In fact, Adobe Reader can always FILL forms. But then what? Now you have to ask the real questions. What do you want to happen NEXT? Submit to a web server in FDF format (works)? Submit to a web server in PDF format? Submit by email (Really, really not recommended)? Print out? Save to disk? Many of these don't just work, it's only the filling that does.