I have a recurring meeting on my calendar in Outlook 2010 of which I am the organizer. If I choose " open this occurrence" , Outlook will not let me close the meeting window without sending an update to all attendees. Whether I click on the X button or choose close from the backstage file menu, Outlook just ignores the command and doesn't close the window. The window remains responsive to other commands; it just refuses to close. The only way to close the window is to either send an update to all attendees (annoying to them) or kill Outlook via task manager and start over (annoying to me). If I choose " open the series" instead of " open this occurrence" the meeting functions normally. I have tried deleting and recreating the meeting multiple times but I always have the same problem.