MyBB Community Forums

I want to convert Every post in wordprss in to mybb is it possible if yes then how i can do that ?

You'll need a custom script written, it isn't supported by the Merge System as it isn't a forum system.

Is that even possible since WordPress is a blog CMS and MyBB is a forum CMS, you could probably write a script that imports all the posts to your forum but the script will have to also convert all the WordPress categories into forums/categories and put those converted posts in the write MyBB forums/category.

Well good luck but I think your better of just transferring them by hand unless you find a perfect script that does the job.