Propose New Time

Hi,

We are using Windows XP Professional with Office 2003 and Outlook 2003 with
internet mail.

In Outlook when sending meeting invites everyone in the office has the
option to "Propose New Time" except one person. This person happens to be
the owner of the company. The button is grayed out in the calendar and in
the email it doesn't appear at all. He gets the other options to Accept and
Decline, but no Propose New Time option. Does anyone know what would cause
this?

Thanks.