Hi, Ive setup Exchange 2003 to accept Active Sync users to synchronize data with there PDA The problem is i can synchronize as administrator but i cant synchronise with any user I will try to specify some settings on the server IIS: at the moment the exchange virtual directory and the active sync directory both have ' integrated windows verification' and basic verifcation on ive tried all options varations but none works .. All pc's have access from the outside, at the moment im not using SSL cause i dont want to make it thougher then it apparently already is ;-) as i said i CAN make a synch when i use the administrator login/pass on the pda but when i login with a user it gives me HTTP_400 or/and HTTP_500 and disconnects. i already did the following tricks from MS : putting SMTProxy string in the register of the server - didnt work Exchange: giving all rights on the mailbox of the user - didnt work I have no clue where to look anymore for the users.. Any Idea? Kind regards, Eddy Keim