Hello, Help please!!!

I need comunicate the address book and collaborative information from MS
Exchange Server to Open-Xchange Server, it has its own users, but i need
that  this users collaborate with users on Exhchange Server. This is
possible ?

Thanks.
-- 
"La vida es muy peligrosa. No por las personas que hacen el mal, sino por
las que se sientan a ver lo que pasa."
Albert Einstein.