I am using phpbb version 3.1.5 and i have it working all fine.
Here is how my site is laid out. (ROOT/wordpress/phpbb)
As you can see i have a main wordpress site then inside the wordpress folder i have my phpbb folder.
Now because my domain is pointed to ROOT folder. I have to type my domain like this -> http://www.abc.com/wordpress/
to get to my wordpress site. The root folder is empty. And I use http://www.abc.com/wordpress/phpbb/
to get to my forum.
What i want to do is go to my hosting and change my domain to point to wordpress folder instead of ROOT. so that when i type http://www.abc.com
it will go directly to my wordpress page. And when i type http://www.abc.com/phpbb/
it will go to my forum page.
My question is if i do that, will my phpbb forum be okay so would it break?