Checked in message on the CompanyWeb calendar page

Hello everyone,

I'm new ot SBS 2011 and have it setup for a small 5 user network.  We are using the calendar option on the CompanyWeb page to allow the users to schedule appointments with business clients.  It has been working fine but now we get a yellow message line saying the following:

Status Checked in but being edited and checked out exclusively to Steve

Is there something in the calendar that is checked out by this user?  If so how can I find out what it is?  How can it be changed or removed?

Thanks for all the advice!!!

Troy