I don't know about you Xain, but I see no multi-posts in this thread.
Bumping old topics in some instances is acceptable, as there is not a lot of activity in certain forums. Of course, three months, I find is unacceptable, but less than a month is fine in my books.
It is only a bannable offense if you are persistant, by the way. By no means can you be banned for one offense.