We are testing Outlook 2010 with Exchange 2003 server. The problem we are having is users in the test group not able to update tasks and calendars. They get "This item was not completely updated during the last server synchronization. Click here to review other versions." in Outlook. Clicking on the message brings up the View Local Failures screen. The same users do not have this problem when updating the same tasks and calendar events using Outlook 2003. I searched Microsoft and found only KB933099 addressing this error, but it's targeted for CRM 3.0 users. Anyone had seen this and has a solution? Thank you very much in advance for your help.