Hi Rick, I can log on also successfully with "basic" on OWA browser. I can also read any messages and it doesn't appear any "LOADING..." message on browser. BUT: if I try to create a new object (for example creeate new mail), the I have again the error on browser "obeject expected". It is definetly JavaScript problem in OWA. I have the same results if I start OWA on the front-end machine. I have applied all patches & hotfixes on all internal servers (back-end, front-end, active directory). I have no problem if I log on the back-end exchange by using OWA. The problem is on front-end. Any other ideas??? Plase response me.. Thanks Mustafa