A room disappears in Scheduling Assistant when you create a meeting in Exchange 2013

Issue:

When a meeting is scheduled using outlook and a room mailbox is selected as a resource, the room mailbox displays for a few seconds and then disappears.

Cause:

1. This issue occurs if an ampersand (&) character is used in the SMTP address of the room mailbox
2. This issue also occurs if invalid working hours are set in the room mailbox i.e. the end time occurs earlier than the start time.

Resolution:

1. For cause 1 please remove the ampersand (&) character from the SMTP address.
2. For cause 2 please open the room mailbox in OWA and correct the working hours or please use the PowerShell commands below to update the correct working hours.

   Set-MailboxCalendarConfiguration -Identity username -WorkingHoursStartTime hh:mm:ss

   Set-MailboxCalendarConfiguration -Identity username -WorkingHoursEndTime hh:mm:ss

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