Getting errors in scheduling appointments

Recently, I recieved an e-mail for a business appointment that included the
outlook calender schedule. I accepted the appointment and it was placed into
my Outlook calender. However, since that time, I have been unable to
schedule my own appointments and cannot sync my pocket pc (using Active Sync)


When I attempt to schedule a new appointment on my desk top, nothing
happens. There is no appointment window that opens. When I attempt to
transfer appointments from the pocket pc, I get error messages that state
something about being unable to set the start time.

Any ideas what is going on?

Thanks