Hi all - a user suddenly has had issue creating calendar entires shared resource. The mailbox gets the request, but does not accept it. It does however accept everyone elses. They also have the same issue with all shared calendars, and nothing noticeable has changed with their domain/group permissions. Thanks!

Solved, KB thread for outlook client, direect booking issue: http://support.microsoft.com/default.aspx?scid=kb;EN-US;982774