I am running exchange on an SBS-2003 server. I use Outlook 2003 on the client machines. Most users are able to share their calendar by clicking the "Share my Calendar" link in the nav pane, or by right clicking thier calendar and selecting "Sharing".
One user has this option greyed out. I have no idea why. Their access rights are the same as other users.
Where should I start looking for the cause?