Room Mailbox – Your meeting request was declined

When you reschedule appointments in a roombox you can get this error:

Your meeting request was declined.
It didn't specify an end date. The end date must be before x/x/xxxx.

To fix this start the Exchange Management Shell and set this commands:

get-CalendarProcessing * |fl |findstr Roombox
set-CalendarProcessing "Roommailbox" -EnforceSchedulingHorizon $false
set-CalendarProcessing "Roommailbox" -BookingWindowInDays 1080

After this cmdlet you can schedule the appointments more than the default 180 days.

Author: Thomas Faddegon

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