Outlook 2003 Shared Calendar not always updating

Hi everyone

I am hoping someone may be able to help me

I have just taken over the IT work at a small company with 3 offices two of which run exchange and outlook 2003. The company uses quite a number of shared calendars. The problem they are having is that sometimes some of the shared calendars are not being refreshed to the other people that are looking at them from client machines. This then means that appointments are being made in times that have been already used for other appointments. The company has 3 sites and 2 exchange servers and they use terminal services and 2x application server for remote sessions.

Any help with this problem would be greatly appreciated

Craig