1: older apps written for older php and mysql versions aren't always compatible, however ubbthreads will be ( it already _is_ on my systems, where i run latest php/mysql/apache )
2: yes
3: yes, but you'll need to know how to do that
3 v2.0: Same as v7.5.6, i believe, although the minimums might increase (which can only be a good thing, anyway)
