Move folders from one dropbox to another

Move folders from one dropbox to another

I have 2 dropbox accounts namely A and B (both are free accounts)
I want to know, how do i completely move a folder from A to B free-ing up
the correspondng size of that folder from A ?
I want to do this because the em-mail id linked with A is my majorly used
one and most of my family and friends know that where-as the one i used
for signing up for B is not. Hence I want to free-up stuff in account A so
that people can still keep sharing stuff with me.