Pieter van der Walt wrote:

On a seperate PC:
I have created a brand new login profile on a different machine
running Outlook 2007 with exactly the same results. However, when
accessing my mailbox using OWA I can see my appointments.

I suspect something is wronng with the operation of Cached Exchange mode.
Try disabling that and see if it makes a difference.
--
Brian Tillman [MVP-Outlook]