Hi Robert,

i think this will be only possible with a groupcalendar or a rescource
planing add-in for Outlook/Exchange.

Outlook 2007 can "overlay" different calendars, but not protect your
calendar for making an entry in the same time.

Have a look on this site for some "ideas":

"Maintaining a Group Calendar in Outlook"
http://www.slipstick.com/calendar/scheduleall.htm

"Resource Central ":
http://www.add-on.com/products-resource-eng.htm

Maybe it helps.

--
Oliver Vukovics
Share your Outlook PST files without Exchange: Public ShareFolder
Synchronisation for Outlook and Exchange: Public SyncTool
http://www.publicshareware.com


"Abhay" schrieb im Newsbeitrag
...
I have Public calender for conference booking. Unfortunately people are
able
to book room for same time causing issues.
Is there any way to disallow second booking in case room is already booked
by someone.
Help appreciated.