"The problem has to do with organizations having calendar appointments and meeting requests "disappear", get corrupt, meeting delegates (boss/assistant) having challenges with appointments showing up, disappearing, reappearing, etc."
Link courtesy of Ed Buford
"Beyond the previous post of general complaints of slowness and sluggishness in Outlook and Exchange, the other complaint I hear frequently these days is specific to Calendaring. Part of it is calendaring performance (where it might take 20-30 seconds to open up somebody else's calendar to view their calendar) which all of the points I note in the other blog post referenced above will apply to performance issues in calendaring."