Hi Jerry and B_Owned,
Thanks for you replies. This issues is efecting all users and is happening in two separte BES 4 sites that I look after and neither site has any connection to the other. Both environments use Exchange 2003, Outlook 2003, Bes 4 and BB 8700g handsets. Unfortunately due to the nature of the end users dong wired sync's is not an option. Checked the dll's and both seem to match.