Hi again, I'm trying to sync a DELL Axim running pocketPC2002 with the exchange 2003 server. The contacts and task folders sync fine, but when the calendar sync starts activesync stops with errorcode Synchronisation failed due to an error on the server. Try again, and if the confition persists, contact your system administrator. Error code: SYNC_5 I've searched the internet for what is going wrong but there are to many different reports on what this means and how to resolve this. I've tried to edit the servers registry as suggested on the microsoft support site and i've verified that OMA is enabled. Can anyone help me out? Greetings, Marcel