we have an exchange 2010 server and have everyones calendar setup so that anyone in the company can edit anyones calendar directly without haivng to invite them. The issue is when some people edit the calendar the changes aren't showing up on everyones outlook. For example, say user A has a calendar shared to everyone and user B edits the calendar on user A, then user C doesn't see the changes that user A made in outlook. Everyone is using different versions of outlook from 2003 to 2010. What could possibly cause this issue?